Pub Date : 2023-05-05DOI: 10.1080/00387010.2023.2208650
Ahmet Murat Erturan, H. Durmaz, S. S. Gültekin
Abstract Biomolecule detection has become important in many applications such as medical diagnosis, forensic analysis, basic biological studies, and food quality assessment. In particular, the Mid-infrared range offers an important opportunity for biomolecular sensing as it covers the molecular vibrational spectra of vital biochemicals such as Deoxyribonucleic acid, Ribonucleic Acid, and proteins. In this study, a double band absorbing plasmonic nanoantenna array with two gold disk resonators is proposed. The biosensing ability of this structure was investigated using the protein-goat anti-mouse immunoglobulin G model and Polymethyl methacrylate film. The basic structural bonds of protein monolayer, namely Amide-I, Amide-II, and Amide-III showed vibrational signatures at 6010 nm (∼1664 cm−1), 6496 nm (∼1539 cm−1), and 6989 nm (∼1431 cm−1) wavelengths, respectively. In addition, the spectral response of the proposed antenna structure was investigated using a Polymethyl methacrylate film by detecting the C=O and the C-H bonds. The strong dipole moment at C=O showed a strong absorption deep at 5782 nm (∼1730 cm−1) while the C-H bond has shown a relatively low absorption deep at 3350 nm (∼2985 cm−1) and 3395 nm (∼2946 cm−1). Our findings indicate that the double spacer disk configuration detects the spectral signature of the protein monolayer and Polymethyl methacrylate film in each band, simultaneously. The dual-band can be tuned independently by carefully engineering the radii of the double disks without making an effect on the other band. The proposed structure can be used as a characterization tool for identifying unknown complex molecules by simply detecting their spectral fingerprints in each mode of the dual-band, independently. Also, this design strategy can be insight to multi-mode SEIRA platforms, where more complex chemical molecules are needed to be detected or identified in biology, chemistry, and defense areas.
{"title":"Simultaneous detection of molecules with the surface-enhanced infrared absorption sensor platform based on disk antennas with double spacer","authors":"Ahmet Murat Erturan, H. Durmaz, S. S. Gültekin","doi":"10.1080/00387010.2023.2208650","DOIUrl":"https://doi.org/10.1080/00387010.2023.2208650","url":null,"abstract":"Abstract Biomolecule detection has become important in many applications such as medical diagnosis, forensic analysis, basic biological studies, and food quality assessment. In particular, the Mid-infrared range offers an important opportunity for biomolecular sensing as it covers the molecular vibrational spectra of vital biochemicals such as Deoxyribonucleic acid, Ribonucleic Acid, and proteins. In this study, a double band absorbing plasmonic nanoantenna array with two gold disk resonators is proposed. The biosensing ability of this structure was investigated using the protein-goat anti-mouse immunoglobulin G model and Polymethyl methacrylate film. The basic structural bonds of protein monolayer, namely Amide-I, Amide-II, and Amide-III showed vibrational signatures at 6010 nm (∼1664 cm−1), 6496 nm (∼1539 cm−1), and 6989 nm (∼1431 cm−1) wavelengths, respectively. In addition, the spectral response of the proposed antenna structure was investigated using a Polymethyl methacrylate film by detecting the C=O and the C-H bonds. The strong dipole moment at C=O showed a strong absorption deep at 5782 nm (∼1730 cm−1) while the C-H bond has shown a relatively low absorption deep at 3350 nm (∼2985 cm−1) and 3395 nm (∼2946 cm−1). Our findings indicate that the double spacer disk configuration detects the spectral signature of the protein monolayer and Polymethyl methacrylate film in each band, simultaneously. The dual-band can be tuned independently by carefully engineering the radii of the double disks without making an effect on the other band. The proposed structure can be used as a characterization tool for identifying unknown complex molecules by simply detecting their spectral fingerprints in each mode of the dual-band, independently. Also, this design strategy can be insight to multi-mode SEIRA platforms, where more complex chemical molecules are needed to be detected or identified in biology, chemistry, and defense areas.","PeriodicalId":21953,"journal":{"name":"Spectroscopy Letters","volume":"56 1","pages":"283 - 292"},"PeriodicalIF":1.7,"publicationDate":"2023-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41409372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-04DOI: 10.1080/00387010.2023.2206474
Di Feng, Shan-shan Xu, Bao‐Ying Wen, M. Kathiresan, Yue-jiao Zhang, An Wang, Fan-Li Zhang, Shangzhong Jin, Jian‐Feng Li
Abstract Abuse of dopings is one of the serious issues affecting competitive sports globally. Traditional means of analysis for doping detection face the challenges of costly, bulky, and complicated pretreatment, as well as long detection times. Therefore, it is critical to achieve on-site and rapid detection for dopings. Herein, we proposed a strategy for ultrasensitive and quick detection of multiple dopings using a combination of liquid phase extraction and surface-enhanced Raman spectroscopy. The clenbuterol, methadone, oxycodone, and chlordiazepoxide were four dopings, which could be detected conveniently in human saliva and urine using the above approach. The limit of detection for clenbuterol, methadone, oxycodone, and chlordiazepoxide in saliva were 25, 10, 50, and 25 ng/mL, respectively, and in urine, 25, 5, 50, and 25 ng/mL. Finally, in about a minute, four dopings at concentration of 100 ng/mL in saliva and urine can be detected accurately and synchronously. This synchronous detection strategy further demonstrates the enormous advantages of SERS in on-site and rapid detection of multiple drugs.
{"title":"Ultrasensitive and rapid detection for multiple dopings in saliva and urine using surface-enhanced Raman spectroscopy","authors":"Di Feng, Shan-shan Xu, Bao‐Ying Wen, M. Kathiresan, Yue-jiao Zhang, An Wang, Fan-Li Zhang, Shangzhong Jin, Jian‐Feng Li","doi":"10.1080/00387010.2023.2206474","DOIUrl":"https://doi.org/10.1080/00387010.2023.2206474","url":null,"abstract":"Abstract Abuse of dopings is one of the serious issues affecting competitive sports globally. Traditional means of analysis for doping detection face the challenges of costly, bulky, and complicated pretreatment, as well as long detection times. Therefore, it is critical to achieve on-site and rapid detection for dopings. Herein, we proposed a strategy for ultrasensitive and quick detection of multiple dopings using a combination of liquid phase extraction and surface-enhanced Raman spectroscopy. The clenbuterol, methadone, oxycodone, and chlordiazepoxide were four dopings, which could be detected conveniently in human saliva and urine using the above approach. The limit of detection for clenbuterol, methadone, oxycodone, and chlordiazepoxide in saliva were 25, 10, 50, and 25 ng/mL, respectively, and in urine, 25, 5, 50, and 25 ng/mL. Finally, in about a minute, four dopings at concentration of 100 ng/mL in saliva and urine can be detected accurately and synchronously. This synchronous detection strategy further demonstrates the enormous advantages of SERS in on-site and rapid detection of multiple drugs.","PeriodicalId":21953,"journal":{"name":"Spectroscopy Letters","volume":"56 1","pages":"249 - 262"},"PeriodicalIF":1.7,"publicationDate":"2023-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42947318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-29DOI: 10.1080/00387010.2023.2204900
Xiaoli Li, Zhao-shui Yu, Bin Liu, Xuemiao Du, Jinli Xu, Jinfeng Bai
Abstract The emergence of the integrated wavelength-dispersive and energy-dispersive Zetium X-ray fluorescence spectrometer technique offered new chances to analyze elemental distribution with minimal sample preparation in complex matrix geological samples-northern Hainan island soils. Wavelength-dispersive X-ray fluorescence was applied for the measurement of bromine in the northern Hainan island soil. To reduce the fluctuations of the low-bromine-content measurement results, a two-channel measurement of bromine was designed, and the average value of the two-channel measurements was used as the final result. The soil samples in northern Hainan Island were rich in iodine, with a content range of a few µg/g to more than 100 µg/g, and these were particularly suitable to be analyzed by energy-dispersive X-ray fluorescence spectrometer. The geological samples in northern Hainan Island were brown, purple, and brown-red soil containing kaolinite, ilmenite, rutile, anatase, and goethite. These soil samples were rich in titanium, aluminum, and iron. The titanium concentration in the northern Hainan Island soil was anomalously high (up to 15.05%), far exceeding the content range of the calibration curve. Owing to the empirical coefficient matrix correction method, unreliable or even unreasonable results were obtained for some elements. By systematically mitigating matrix effects through the development of custom reference materials and building matrix-matched measurement and calibration routines, the quantification of Vanadium, Barium, and major components in northern Hainan Island soil samples was optimized. The efficacy of the X-ray fluorescence spectrometer method was confirmed by comparison with inductively coupled plasma–optical emission spectroscopy analysis. This work demonstrates the capability of the integrated wavelength-dispersive and energy-dispersive Zetium X-ray fluorescence spectrometer technique for reliable quantitative elemental analysis of complex matrix geological samples.
{"title":"Determination of bromine, iodine, and other components in northern Hainan island soil","authors":"Xiaoli Li, Zhao-shui Yu, Bin Liu, Xuemiao Du, Jinli Xu, Jinfeng Bai","doi":"10.1080/00387010.2023.2204900","DOIUrl":"https://doi.org/10.1080/00387010.2023.2204900","url":null,"abstract":"Abstract The emergence of the integrated wavelength-dispersive and energy-dispersive Zetium X-ray fluorescence spectrometer technique offered new chances to analyze elemental distribution with minimal sample preparation in complex matrix geological samples-northern Hainan island soils. Wavelength-dispersive X-ray fluorescence was applied for the measurement of bromine in the northern Hainan island soil. To reduce the fluctuations of the low-bromine-content measurement results, a two-channel measurement of bromine was designed, and the average value of the two-channel measurements was used as the final result. The soil samples in northern Hainan Island were rich in iodine, with a content range of a few µg/g to more than 100 µg/g, and these were particularly suitable to be analyzed by energy-dispersive X-ray fluorescence spectrometer. The geological samples in northern Hainan Island were brown, purple, and brown-red soil containing kaolinite, ilmenite, rutile, anatase, and goethite. These soil samples were rich in titanium, aluminum, and iron. The titanium concentration in the northern Hainan Island soil was anomalously high (up to 15.05%), far exceeding the content range of the calibration curve. Owing to the empirical coefficient matrix correction method, unreliable or even unreasonable results were obtained for some elements. By systematically mitigating matrix effects through the development of custom reference materials and building matrix-matched measurement and calibration routines, the quantification of Vanadium, Barium, and major components in northern Hainan Island soil samples was optimized. The efficacy of the X-ray fluorescence spectrometer method was confirmed by comparison with inductively coupled plasma–optical emission spectroscopy analysis. This work demonstrates the capability of the integrated wavelength-dispersive and energy-dispersive Zetium X-ray fluorescence spectrometer technique for reliable quantitative elemental analysis of complex matrix geological samples.","PeriodicalId":21953,"journal":{"name":"Spectroscopy Letters","volume":"56 1","pages":"238 - 248"},"PeriodicalIF":1.7,"publicationDate":"2023-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41609203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-28DOI: 10.1080/00387010.2023.2206483
Kayssar Eid, Kassandra Fares, R. Matta, E. El-Hayek, Rony Abou-Khalil
Abstract The enzymatic browning of apples by polyphenol oxidase is a major drawback in the food industry. The change in the color, taste, and texture discourage the client from buying these fruits in the market. The description of this enzyme’s characteristics can be helpful in preventing the adverse consequences of the reaction. A study was carried out using polyphenol oxidase extracted from “Red delicious” apples cultivated in Laklouk, a small mountainous village located 69 km northeast of Beirut, Lebanon. The enzyme extraction was performed using phosphate buffer (0.1 M, pH 6.5), ascorbic acid, 3% polyvinylpolypyrrolidone, and 0.5% TritonX-100. The enzymatic reaction catalyzed by polyphenol oxidase was held using pyrocatechol (20 mM) as substrate. The optimum temperature and the optimum pH at which the enzyme shows maximal activity were determined. The stability of the enzyme after incubation at different temperatures was studied, and the major kinetic and thermodynamic parameters were calculated. The enzyme exhibits optimal activity at pH 5.5 and at 303 K. Higher or lower temperatures majorly reduce the enzyme activity. Apple polyphenol oxidase heat inactivation showed a first-order decay approach. The means of thermodynamic parameters suggest that polyphenol oxidase catalyzed reaction is endergonic with insignificant dispersion in the reaction medium. The results also provided information on the stability and structural resistance of the enzyme. This study determines for the first time some characteristics of polyphenol oxidase extracted from Lebanese apples. The knowledge of the enzyme activity can generate helpful instructions. This data taken into consideration while harvesting, handling, and processing apples, will help in reducing undesirable wastage of fruits and permitting economical savings.
{"title":"Apple waste management: a study on polyphenol oxidase activity","authors":"Kayssar Eid, Kassandra Fares, R. Matta, E. El-Hayek, Rony Abou-Khalil","doi":"10.1080/00387010.2023.2206483","DOIUrl":"https://doi.org/10.1080/00387010.2023.2206483","url":null,"abstract":"Abstract The enzymatic browning of apples by polyphenol oxidase is a major drawback in the food industry. The change in the color, taste, and texture discourage the client from buying these fruits in the market. The description of this enzyme’s characteristics can be helpful in preventing the adverse consequences of the reaction. A study was carried out using polyphenol oxidase extracted from “Red delicious” apples cultivated in Laklouk, a small mountainous village located 69 km northeast of Beirut, Lebanon. The enzyme extraction was performed using phosphate buffer (0.1 M, pH 6.5), ascorbic acid, 3% polyvinylpolypyrrolidone, and 0.5% TritonX-100. The enzymatic reaction catalyzed by polyphenol oxidase was held using pyrocatechol (20 mM) as substrate. The optimum temperature and the optimum pH at which the enzyme shows maximal activity were determined. The stability of the enzyme after incubation at different temperatures was studied, and the major kinetic and thermodynamic parameters were calculated. The enzyme exhibits optimal activity at pH 5.5 and at 303 K. Higher or lower temperatures majorly reduce the enzyme activity. Apple polyphenol oxidase heat inactivation showed a first-order decay approach. The means of thermodynamic parameters suggest that polyphenol oxidase catalyzed reaction is endergonic with insignificant dispersion in the reaction medium. The results also provided information on the stability and structural resistance of the enzyme. This study determines for the first time some characteristics of polyphenol oxidase extracted from Lebanese apples. The knowledge of the enzyme activity can generate helpful instructions. This data taken into consideration while harvesting, handling, and processing apples, will help in reducing undesirable wastage of fruits and permitting economical savings.","PeriodicalId":21953,"journal":{"name":"Spectroscopy Letters","volume":"56 1","pages":"263 - 272"},"PeriodicalIF":1.7,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48509439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-28DOI: 10.1080/00387010.2023.2206906
Rachna Joshi
Abstract The dipole polarizabilities, dipole and quadruple oscillator strengths and relativistic energy corrections are calculated for plasma embedded C VI ion which is of relevance in astrophysics and plasma physics. Numerical simulation of Numerov method is used to find the energy eigenvalues and eigenfunctions by solving the time-independent Schrodinger equation. The dependence of dipole and quadruple polarizabilities, oscillator strengths and relativistic energy corrections on Debye length is shown.
{"title":"Fine structure calculations, polarizability and oscillator strengths for C VI ion embedded in Debye plasma applying accurate Numerov method","authors":"Rachna Joshi","doi":"10.1080/00387010.2023.2206906","DOIUrl":"https://doi.org/10.1080/00387010.2023.2206906","url":null,"abstract":"Abstract The dipole polarizabilities, dipole and quadruple oscillator strengths and relativistic energy corrections are calculated for plasma embedded C VI ion which is of relevance in astrophysics and plasma physics. Numerical simulation of Numerov method is used to find the energy eigenvalues and eigenfunctions by solving the time-independent Schrodinger equation. The dependence of dipole and quadruple polarizabilities, oscillator strengths and relativistic energy corrections on Debye length is shown.","PeriodicalId":21953,"journal":{"name":"Spectroscopy Letters","volume":"56 1","pages":"273 - 282"},"PeriodicalIF":1.7,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44750006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-21DOI: 10.1080/00387010.2023.2202229
Nehir Kaymak, N. Emre, F. B. Yalım, Cihan Toslak, Y. Emre, Ş. Akın
Abstract It is critical to understand the potential effects of non-native species, especially on ecologically similar native species, and to reveal their trophic relationships. Cyprinid invasive fishes, Carassius gibelio, and translocated fish Cyprinus carpio has been introduced to the Karacaören I reservoir located in the upstream reach of the Aksu River basin. Karacaören reservoir is also an important local habitat for native Cyprinid fishes, Capoeta antalyensis and Squalius fellowesii. In this study, we evaluated the trophic structure and interspecies trophic interactions (as isotopic niches and niche overlaps) of these Cyprinid fish using stable C and N isotopes analysis as measured by Isotope Ratio Mass Spectrometer. While equally all food sources contributed to the biomass of all fish species in the summer, their biomass is supported by more specialized sources in the winter season. Our results revealed increased niche breadth with increased niche overlap between C. antalyensis and C. gibelio, and C. carpio, and among C. gibelio and C. carpio in the summer, while decreased niche breadth with decreased niche overlap in the winter season. Interspecific competition has led to trophic niche divergence, which may facilitate the coexistence of native species with introduced fishes. Non-native fish were determined to have larger niche widths, which may contribute to their invasion success.
{"title":"Seasonal variation in trophic niches and niche overlap between native and introduced cyprinid fishes","authors":"Nehir Kaymak, N. Emre, F. B. Yalım, Cihan Toslak, Y. Emre, Ş. Akın","doi":"10.1080/00387010.2023.2202229","DOIUrl":"https://doi.org/10.1080/00387010.2023.2202229","url":null,"abstract":"Abstract It is critical to understand the potential effects of non-native species, especially on ecologically similar native species, and to reveal their trophic relationships. Cyprinid invasive fishes, Carassius gibelio, and translocated fish Cyprinus carpio has been introduced to the Karacaören I reservoir located in the upstream reach of the Aksu River basin. Karacaören reservoir is also an important local habitat for native Cyprinid fishes, Capoeta antalyensis and Squalius fellowesii. In this study, we evaluated the trophic structure and interspecies trophic interactions (as isotopic niches and niche overlaps) of these Cyprinid fish using stable C and N isotopes analysis as measured by Isotope Ratio Mass Spectrometer. While equally all food sources contributed to the biomass of all fish species in the summer, their biomass is supported by more specialized sources in the winter season. Our results revealed increased niche breadth with increased niche overlap between C. antalyensis and C. gibelio, and C. carpio, and among C. gibelio and C. carpio in the summer, while decreased niche breadth with decreased niche overlap in the winter season. Interspecific competition has led to trophic niche divergence, which may facilitate the coexistence of native species with introduced fishes. Non-native fish were determined to have larger niche widths, which may contribute to their invasion success.","PeriodicalId":21953,"journal":{"name":"Spectroscopy Letters","volume":"56 1","pages":"227 - 237"},"PeriodicalIF":1.7,"publicationDate":"2023-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42218055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-21DOI: 10.1080/00387010.2023.2201294
W. Guo, Qiantong Song, Jiawei Xue, Zhichao Huangfu, Yuhan He, Yongyan Zhang, XiaoLin Liu, Jun Bao, Zhaohui Wang
Abstract Infrared free electron laser is a unique broadband tuning IR light source and useful tool to trace the reaction and vibrational energy transfer dynamics. It is essential for the infrared free electron laser debug and optimization to accurately characterize the wavelength and micropulse profile of the infrared free electron laser output. By synchronizing the infrared free electron laser and tabletop femtosecond laser with high precision, infrared free electron laser-sum frequency generation setup, a sum frequency generation spectroscopy setup using infrared free electron laser pulses, is developed. Through sum frequency generation cross-correlation, the infrared free electron laser output wavelength and micropulse duration are measured from the delaytime-dependent infrared free electron laser-sum frequency generation spectra of a ZnS window. The infrared free electron laser-sum frequency generation measured infrared free electron laser wavelength is linearly correlated with the theoretically calculation with the fixed electron beam energy and variable undulator magnetic gaps. And the measured micropulse duration is 2.0 ps@5.25 µm and 2.9 ps@8.35 µm. These results demonstrate the excellent ability of sum frequency generation in the diagnostic and characterization of infrared free electron laser output profile, and the quality of the infrared free electron laser pulse structure.
{"title":"Characterization of infrared free electron laser output profile through sum frequency generation spectroscopy","authors":"W. Guo, Qiantong Song, Jiawei Xue, Zhichao Huangfu, Yuhan He, Yongyan Zhang, XiaoLin Liu, Jun Bao, Zhaohui Wang","doi":"10.1080/00387010.2023.2201294","DOIUrl":"https://doi.org/10.1080/00387010.2023.2201294","url":null,"abstract":"Abstract Infrared free electron laser is a unique broadband tuning IR light source and useful tool to trace the reaction and vibrational energy transfer dynamics. It is essential for the infrared free electron laser debug and optimization to accurately characterize the wavelength and micropulse profile of the infrared free electron laser output. By synchronizing the infrared free electron laser and tabletop femtosecond laser with high precision, infrared free electron laser-sum frequency generation setup, a sum frequency generation spectroscopy setup using infrared free electron laser pulses, is developed. Through sum frequency generation cross-correlation, the infrared free electron laser output wavelength and micropulse duration are measured from the delaytime-dependent infrared free electron laser-sum frequency generation spectra of a ZnS window. The infrared free electron laser-sum frequency generation measured infrared free electron laser wavelength is linearly correlated with the theoretically calculation with the fixed electron beam energy and variable undulator magnetic gaps. And the measured micropulse duration is 2.0 ps@5.25 µm and 2.9 ps@8.35 µm. These results demonstrate the excellent ability of sum frequency generation in the diagnostic and characterization of infrared free electron laser output profile, and the quality of the infrared free electron laser pulse structure.","PeriodicalId":21953,"journal":{"name":"Spectroscopy Letters","volume":"56 1","pages":"218 - 226"},"PeriodicalIF":1.7,"publicationDate":"2023-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48503458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-08DOI: 10.1080/00387010.2023.2197992
L. Lepodise, Tshepo Pheko-Ofitlhile
Abstract Terahertz spectroscopic studies of 4-octyloxybenzoic acid, 4-decyloxybenzoic acid and 4-hexylbenzoic acid liquid crystals were performed using the Fourier Transform Infrared method. The materials are characterized by distinct absorption bands in the 6–18 terahertz frequency range. A good correspondence was observed between the experimental frequencies and theoretical frequencies of the single molecule obtained by Density Functional Theory calculations for all the three compounds. The spectra of the studied compounds had three bands, which appeared at similar frequencies and with the same vibration modes. 4-Octyloxybenzoic acid, 4-decyloxybenzoic acid and 4-hexylbenzoic acid had two absorption bands that appeared at similar frequencies and exhibited different vibration modes. This study interestingly demonstrates that even though compounds of an almost similar molecular structure might output bands at the same frequencies, the correspondence might not be apparent. The single molecule model frequencies and experimental frequencies for 4-decyloxybenzoic acid and 4-octyloxybenzoic acid further revealed that all the observed bands are due to intramolecular interaction. However, the 4-hexylbenzoic acid spectrum has one apparently intermolecular band. This work addresses the limitation in the intermediate terahertz spectroscopic studies of liquid crystals and furthermore emphasizes the robustness of Fourier Transform Infrared technique in identifying materials with similar attributes.
{"title":"Terahertz (6-18 THz) spectroscopic characterization of benzoic acid class liquid crystals using Fourier Transform Infrared technique","authors":"L. Lepodise, Tshepo Pheko-Ofitlhile","doi":"10.1080/00387010.2023.2197992","DOIUrl":"https://doi.org/10.1080/00387010.2023.2197992","url":null,"abstract":"Abstract Terahertz spectroscopic studies of 4-octyloxybenzoic acid, 4-decyloxybenzoic acid and 4-hexylbenzoic acid liquid crystals were performed using the Fourier Transform Infrared method. The materials are characterized by distinct absorption bands in the 6–18 terahertz frequency range. A good correspondence was observed between the experimental frequencies and theoretical frequencies of the single molecule obtained by Density Functional Theory calculations for all the three compounds. The spectra of the studied compounds had three bands, which appeared at similar frequencies and with the same vibration modes. 4-Octyloxybenzoic acid, 4-decyloxybenzoic acid and 4-hexylbenzoic acid had two absorption bands that appeared at similar frequencies and exhibited different vibration modes. This study interestingly demonstrates that even though compounds of an almost similar molecular structure might output bands at the same frequencies, the correspondence might not be apparent. The single molecule model frequencies and experimental frequencies for 4-decyloxybenzoic acid and 4-octyloxybenzoic acid further revealed that all the observed bands are due to intramolecular interaction. However, the 4-hexylbenzoic acid spectrum has one apparently intermolecular band. This work addresses the limitation in the intermediate terahertz spectroscopic studies of liquid crystals and furthermore emphasizes the robustness of Fourier Transform Infrared technique in identifying materials with similar attributes.","PeriodicalId":21953,"journal":{"name":"Spectroscopy Letters","volume":"56 1","pages":"211 - 217"},"PeriodicalIF":1.7,"publicationDate":"2023-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41678209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-03DOI: 10.1080/00387010.2023.2194950
Xin Li, Jiangping Liu
Abstract Taking adulterated milk as the research object, the principal component analysis method combined with long short-term memory network was used to study, aiming to find a simple and efficient rapid detection method for adulterated milk. In this paper, qualitative and quantitative analysis of adulterated milk was carried out based on near-infrared hyperspectral data (400–1000 nm). The experimental results verified the feasibility of using near-infrared hyperspectral technology to identify adulterated milk.
{"title":"Analysis of adulterated milk based on a long short-term memory network","authors":"Xin Li, Jiangping Liu","doi":"10.1080/00387010.2023.2194950","DOIUrl":"https://doi.org/10.1080/00387010.2023.2194950","url":null,"abstract":"Abstract Taking adulterated milk as the research object, the principal component analysis method combined with long short-term memory network was used to study, aiming to find a simple and efficient rapid detection method for adulterated milk. In this paper, qualitative and quantitative analysis of adulterated milk was carried out based on near-infrared hyperspectral data (400–1000 nm). The experimental results verified the feasibility of using near-infrared hyperspectral technology to identify adulterated milk.","PeriodicalId":21953,"journal":{"name":"Spectroscopy Letters","volume":"56 1","pages":"204 - 210"},"PeriodicalIF":1.7,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42396716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-31DOI: 10.1080/00387010.2023.2193628
Mohamed U. Zakariya, Conan Bock, R. Kayastha, A. Dall’Asén
Abstract Raman spectroscopy has been used extensively on meteoritic samples since it is a nondestructive tool that provides information about their structure and mineralogical composition, which can give important clues about planet formation. However, the power of the excitation laser used in this technique can alter the properties of the samples due to thermal effects. In this undergraduate research work, the laser-induced thermal effects produced on the carbonaceous chondritic meteorite Northwest Africa 6603 were studied in detail by analyzing the low- and high-resolution Raman spectra parameters of the minerals found in the inclusions and matrix of this sample as a function of the excitation power. Olivine (forsterite), graphitic carbon, pyroxene (enstatite), hematite and gehlenite were the minerals identified in the studied regions. The Raman parameters of these minerals were affected by the laser power to a greater or lesser extent, indicating an increase in structural disorder. In general, the alterations observed were permanent (reverse changes were not observed). These thermal effects were correlated with the topography of the irradiated regions by analyzing their changes using optical microscopy. The micrographs of a few regions showed changes on their topography after irradiating the regions with the maximum applied power (e.g., more depressed areas). These findings exhibited strong evidence of the thermal effects induced by the laser power on the materials found in this fragment, which must be considered to avoid alterations of the physical and chemical properties of the meteoritic samples. In addition, this work presents the first study done on the mineralogical composition of Northwest Africa 6603 using Raman spectroscopy. Furthermore, from an educational standpoint, this project exposed the involved undergraduate physics students to numerous research steps (e.g., experiment preparation, data acquisition/analysis, and manuscript preparation) which provided them with a broad spectrum of valuable scientific and technical tools for their future careers.
{"title":"Thermal effects of the excitation laser power on carbonaceous meteorite Northwest Africa 6603 by Raman spectroscopy: an undergraduate research project","authors":"Mohamed U. Zakariya, Conan Bock, R. Kayastha, A. Dall’Asén","doi":"10.1080/00387010.2023.2193628","DOIUrl":"https://doi.org/10.1080/00387010.2023.2193628","url":null,"abstract":"Abstract Raman spectroscopy has been used extensively on meteoritic samples since it is a nondestructive tool that provides information about their structure and mineralogical composition, which can give important clues about planet formation. However, the power of the excitation laser used in this technique can alter the properties of the samples due to thermal effects. In this undergraduate research work, the laser-induced thermal effects produced on the carbonaceous chondritic meteorite Northwest Africa 6603 were studied in detail by analyzing the low- and high-resolution Raman spectra parameters of the minerals found in the inclusions and matrix of this sample as a function of the excitation power. Olivine (forsterite), graphitic carbon, pyroxene (enstatite), hematite and gehlenite were the minerals identified in the studied regions. The Raman parameters of these minerals were affected by the laser power to a greater or lesser extent, indicating an increase in structural disorder. In general, the alterations observed were permanent (reverse changes were not observed). These thermal effects were correlated with the topography of the irradiated regions by analyzing their changes using optical microscopy. The micrographs of a few regions showed changes on their topography after irradiating the regions with the maximum applied power (e.g., more depressed areas). These findings exhibited strong evidence of the thermal effects induced by the laser power on the materials found in this fragment, which must be considered to avoid alterations of the physical and chemical properties of the meteoritic samples. In addition, this work presents the first study done on the mineralogical composition of Northwest Africa 6603 using Raman spectroscopy. Furthermore, from an educational standpoint, this project exposed the involved undergraduate physics students to numerous research steps (e.g., experiment preparation, data acquisition/analysis, and manuscript preparation) which provided them with a broad spectrum of valuable scientific and technical tools for their future careers.","PeriodicalId":21953,"journal":{"name":"Spectroscopy Letters","volume":"56 1","pages":"183 - 193"},"PeriodicalIF":1.7,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41568843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：