A. Lamberti, C. Sanges, N. Migliaccio, L. Stefano, I. Rea, E. Orabona, G. Scala, I. Rendina, P. Arcari
One of the most important goals in the fields of biology and medicine is the possibility to dispose of efficient tools for the characterization of the extraordinary complexity of ligand-receptor interactions. To approach this theme, we explored the use of crystalline silicon (cSi) technology for the realization of a biotechnological device in which the ligand-receptor interactions are revealed by means of optical measurements. Here, we describe a chemical procedure for the functionalization of microwell etched on silicon wafers, and the subsequent anchoring of biological molecules like an antibody anti-A20 murine lymphoma cell line. The optical analysis of the interaction on the biochips between the bound biomolecule and their corresponding ligand indicated that the functionalized cSi is suitable for this application.
{"title":"Silicon-Based Technology for Ligand-Receptor Molecular Identification","authors":"A. Lamberti, C. Sanges, N. Migliaccio, L. Stefano, I. Rea, E. Orabona, G. Scala, I. Rendina, P. Arcari","doi":"10.1155/2012/948390","DOIUrl":"https://doi.org/10.1155/2012/948390","url":null,"abstract":"One of the most important goals in the fields of biology and medicine is the possibility to dispose of efficient tools for the characterization of the extraordinary complexity of ligand-receptor interactions. To approach this theme, we explored the use of crystalline silicon (cSi) technology for the realization of a biotechnological device in which the ligand-receptor interactions are revealed by means of optical measurements. Here, we describe a chemical procedure for the functionalization of microwell etched on silicon wafers, and the subsequent anchoring of biological molecules like an antibody anti-A20 murine lymphoma cell line. The optical analysis of the interaction on the biochips between the bound biomolecule and their corresponding ligand indicated that the functionalized cSi is suitable for this application.","PeriodicalId":15106,"journal":{"name":"Journal of Atomic and Molecular Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84727363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. I. Jaman, Rangana Bhattacharya, Debasish Mandal, A. Das
The ground-state () millimeterwave rotational spectrum of propynal (HCCCHO) produced by a DC glow discharge through a low-pressure (~10–20 mTorr) flow of propargyl alcohol (HCCCH2OH) vapor has been observed in the frequency region: 36.0–94.0 GHz. Measured rotational transition frequencies along with the previously reported microwave and millimeterwave transitions were fitted to a standard asymmetric-top Hamiltonian to determine an improved set of rotational and centrifugal distortion constant. Detailed DFT calculations were also carried out with various functional and basis sets to evaluate the spectroscopic constants, dipole moment, and various structural parameters of propynal and compared with the corresponding experimental values.
{"title":"Millimeterwave Spectral Studies of Propynal (HCCCHO) Produced by DC Glow Discharge and Ab Initio DFT Calculation","authors":"A. I. Jaman, Rangana Bhattacharya, Debasish Mandal, A. Das","doi":"10.1155/2011/439019","DOIUrl":"https://doi.org/10.1155/2011/439019","url":null,"abstract":"The ground-state () millimeterwave rotational spectrum of propynal (HCCCHO) produced by a DC glow discharge through a low-pressure (~10–20 mTorr) flow of propargyl alcohol (HCCCH2OH) vapor has been observed in the frequency region: 36.0–94.0 GHz. Measured rotational transition frequencies along with the previously reported microwave and millimeterwave transitions were fitted to a standard asymmetric-top Hamiltonian to determine an improved set of rotational and centrifugal distortion constant. Detailed DFT calculations were also carried out with various functional and basis sets to evaluate the spectroscopic constants, dipole moment, and various structural parameters of propynal and compared with the corresponding experimental values.","PeriodicalId":15106,"journal":{"name":"Journal of Atomic and Molecular Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81074766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We numerically investigate the optical transmission through a compound spherical stack with conventional and metamaterial (MM) layers and also embedded MM defect. A formation of extremely narrow resonant peak with nearly complete transmittance in area of a band gap is found. We demonstrate that photon fields of certain frequencies can be strongly confined by a left-handed (LH) defect. The influence of a random deviation in the width of compound spherical layers as well the transit to the whispering gallery mode (WGM) is also discussed.
{"title":"The Field Confinement, Narrow Transmission Resonances, and Green Function of a Multilayered Microsphere with Metamaterial Defects","authors":"G. Burlak, A. Díaz-de-Anda","doi":"10.1155/2011/217020","DOIUrl":"https://doi.org/10.1155/2011/217020","url":null,"abstract":"We numerically investigate the optical transmission through a compound spherical stack with\u0000conventional and metamaterial (MM) layers and also embedded MM defect. A formation of extremely narrow resonant peak with nearly complete transmittance in area of a band gap is found.\u0000We demonstrate that photon fields of certain frequencies can be strongly confined by a left-handed\u0000(LH) defect. The influence of a random deviation in the width of compound spherical layers as\u0000well the transit to the whispering gallery mode (WGM) is also discussed.","PeriodicalId":15106,"journal":{"name":"Journal of Atomic and Molecular Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84522086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Abel, L. Frommhold, Xiaoping Li, Katherine L.C. Hunt
We have recently determined the induced dipole surface (IDS) and potential energy surface (PES) of collisional H2-He complexes. We have used these surfaces to compute the binary collision-induced absorption spectra of H2 molecules interacting with He atoms and of D2 molecules interacting with He atoms. Here we extend these calculations to the case of T2 molecules interacting with He atoms. Whereas the electronic structure of X2-He is virtually the same for all hydrogen isotopes X = H, D, or T, the collisional dynamics and molecular scattering wave functions are different for the different collisional pairs. We have calculated spectra up to a temperature of 9000 K and frequencies up to 20,000 cm−1. Here we compare the calculated collision-induced absorption spectra for the different hydrogen isotopes. While we have observed reasonable agreement between our calculations and laboratory measurements for the collisional H2-He and D2-He complexes, there are no laboratory measurements for T2-He collisional complexes, and one must rely on the fundamental theory, supported by the agreement between theory and experiment for the other isotopes.
{"title":"Comparison of the Calculated Collision-Induced Absorption Spectra by Dense Hydrogen-Helium, Deuterium-Helium, and Tritium-Helium Gas Mixtures","authors":"M. Abel, L. Frommhold, Xiaoping Li, Katherine L.C. Hunt","doi":"10.1155/2011/470530","DOIUrl":"https://doi.org/10.1155/2011/470530","url":null,"abstract":"We have recently determined the induced dipole surface (IDS) and potential energy surface (PES) of collisional H2-He complexes. We have used these surfaces to compute the binary collision-induced absorption spectra of H2 molecules interacting with He atoms and of D2 molecules interacting with He atoms. Here we extend these calculations to the case of T2 molecules interacting with He atoms. Whereas the electronic structure of X2-He is virtually the same for all hydrogen isotopes X = H, D, or T, the collisional dynamics and molecular scattering wave functions are different for the different collisional pairs. We have calculated spectra up to a temperature of 9000 K and frequencies up to 20,000 cm−1. Here we compare the calculated collision-induced absorption spectra for the different hydrogen isotopes. While we have observed reasonable agreement between our calculations and laboratory measurements for the collisional H2-He and D2-He complexes, there are no laboratory measurements for T2-He collisional complexes, and one must rely on the fundamental theory, supported by the agreement between theory and experiment for the other isotopes.","PeriodicalId":15106,"journal":{"name":"Journal of Atomic and Molecular Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79929321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The millimeter-wave rotational spectra of o-tolunitrile (C6H4CH3CN) have been investigated in the ground torsional state in the frequency range 50.0–75.0 GHz. Many high-J rotational lines with large A-E splitting due to internal rotation of the methyl top have been assigned. A least squares analysis of the A-E splitting of 92 transitions resulted in the determination of accurate values of internal rotation parameters. The observed parameters were compared with the previously reported experimental values and DFT calculation results.
{"title":"Millimeter-Wave Rotational Spectrum, Barrier to Internal Rotation, and DFT Calculation of o-Tolunitrile","authors":"A. I. Jaman, P. H. Kumar, P. Bangal","doi":"10.1155/2011/480396","DOIUrl":"https://doi.org/10.1155/2011/480396","url":null,"abstract":"The millimeter-wave rotational spectra of o-tolunitrile (C6H4CH3CN) have been investigated in the ground torsional state in the frequency range 50.0–75.0 GHz. Many high-J rotational lines with large A-E splitting due to internal rotation of the methyl top have been assigned. A least squares analysis of the A-E splitting of 92 transitions resulted in the determination of accurate values of internal rotation parameters. The observed parameters were compared with the previously reported experimental values and DFT calculation results.","PeriodicalId":15106,"journal":{"name":"Journal of Atomic and Molecular Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80785373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The photochromic and photoanisotropic properties of materials can be used in ordinary and polarization holographic recording respectively. Fulgides are well known as thermally irreversible organic photochromic compounds. And it is found that there exists photoinduced anisotropy in fulgide-doped polymeric films. In this report, a 3-indoly-benzylfulgimide/PMMA film was studied as a holographic storage media. First, the spectra and dynamics of photochromic and photoanisotropic properties of the sample are measured or calculated. Second, the diffraction efficiency (DE) dynamics at 633 nm of four kinds of different polarization holograms recorded in this sample are measured. The maximum DE value about 1% was gotten. Third, the DE spectra and DE dynamics are theoretically calculated in detail, and a good correlation of theoretically derived DE dynamic curves and the measured experimental curves was found. From the DE spectra, it is known that at the wavelengths less than 450 nm or greater than 700 nm, the nondestructive reading can be realized. The DWPS obtained in the experiments are same with the theortically deduced ones, which shows that in the orthogonal polarization holography, the polarization state of the diffracted light is orthogonal to that of the reconstruction light, which is very important to increase the SNR of the holographic storage. And all these results are applied and proved to be correct in high-density holographic image storage experiment. The area density of bits/cm2 was obtained, and the encoded data was retrieved without error.
{"title":"Polarization Holography in 3-Indoly-Benzylfulgimide/PMMA Film","authors":"Neimule Menke, Baoli Yao, Yingli Wang, Yi Chen","doi":"10.1155/2011/509507","DOIUrl":"https://doi.org/10.1155/2011/509507","url":null,"abstract":"The photochromic and photoanisotropic properties of materials can be used in ordinary and polarization holographic recording respectively. Fulgides are well known as thermally irreversible organic photochromic compounds. And it is found that there exists photoinduced anisotropy in fulgide-doped polymeric films. In this report, a 3-indoly-benzylfulgimide/PMMA film was studied as a holographic storage media. First, the spectra and dynamics of photochromic and photoanisotropic properties of the sample are measured or calculated. Second, the diffraction efficiency (DE) dynamics at 633 nm of four kinds of different polarization holograms recorded in this sample are measured. The maximum DE value about 1% was gotten. Third, the DE spectra and DE dynamics are theoretically calculated in detail, and a good correlation of theoretically derived DE dynamic curves and the measured experimental curves was found. From the DE spectra, it is known that at the wavelengths less than 450 nm or greater than 700 nm, the nondestructive reading can be realized. The DWPS obtained in the experiments are same with the theortically deduced ones, which shows that in the orthogonal polarization holography, the polarization state of the diffracted light is orthogonal to that of the reconstruction light, which is very important to increase the SNR of the holographic storage. And all these results are applied and proved to be correct in high-density holographic image storage experiment. The area density of bits/cm2 was obtained, and the encoded data was retrieved without error.","PeriodicalId":15106,"journal":{"name":"Journal of Atomic and Molecular Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73131678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Spectral line broadening is calculated based on a microscopic quantum statistical approach. By using thermodynamic Green's function, plasma correlation effect, electrostatic and dynamic screening, and perturber-radiator interaction are taken into account. Ions are treated in quasistatic approximation due to Stark effect. The line broadening for 6678 A (21P-31D) and 5016 A (21S-31P) transitions of neutral helium is calculated in the electron density range and temperature range , and the density and temperature dependence of the line width are investigated. A good agreement is shown by comparing the calculated values with the existing experimental and theoretical data.
光谱线展宽是基于微观量子统计方法计算的。利用热力学格林函数，考虑了等离子体相关效应、静电和动态筛选以及摄动器-辐射体相互作用。由于斯塔克效应，离子采用准静态近似处理。计算了中性氦的6678 A (21P-31D)和5016 A (21S-31P)跃迁在电子密度和温度范围内的谱线展宽，并研究了谱线宽度与密度和温度的关系。将计算值与已有的实验和理论数据进行了比较，结果表明两者吻合较好。
{"title":"Spectral Line Broadening in Dense Plasmas","authors":"B. Omar","doi":"10.1155/2011/850807","DOIUrl":"https://doi.org/10.1155/2011/850807","url":null,"abstract":"Spectral line broadening is calculated based on a microscopic quantum statistical approach. By using thermodynamic Green's function, plasma correlation effect, electrostatic and dynamic screening, and perturber-radiator interaction are taken into account. Ions are treated in quasistatic approximation due to Stark effect. The line broadening \u0000for 6678 A (21P-31D) and \u0000 5016 A (21S-31P) transitions of neutral helium is calculated in the electron density range and temperature range , and the density and temperature dependence of the line width are investigated. A good agreement is shown by comparing the calculated values with the existing experimental and theoretical data.","PeriodicalId":15106,"journal":{"name":"Journal of Atomic and Molecular Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74179802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The author gives an introduction to Continuum Distorted Wave theory, in the form of a brief review.
作者以简要回顾的形式介绍了连续体畸变波理论。
{"title":"An Introduction to Continuum Distorted Wave Theory","authors":"D. Crothers","doi":"10.1155/2010/604572","DOIUrl":"https://doi.org/10.1155/2010/604572","url":null,"abstract":"The author gives an introduction to Continuum Distorted Wave theory, in the form of a brief review.","PeriodicalId":15106,"journal":{"name":"Journal of Atomic and Molecular Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2010-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72707121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Single electron ionization of helium targets produced by the impact of fast proton beams is investigated. The postversion of the continuum distorted wave-eikonal initial state into a three-body approximation is reformulated, including the dynamic screening produced by the nonionized electron. This dynamic screening is shown to play a main role in the determination of double differential cross-sections. A good agreement is found with predictions obtained employing the prior version of the model, so that post-prior discrepancies are almost eliminated.
{"title":"A Complete Postversion of the Three-Body Continuum Distorted Wave-Eikonal Initial State Approximation for Single Ionization of Multielectron Atoms","authors":"J. Monti, O. Fojón, J. Hanssen, R. Rivarola","doi":"10.1155/2010/128473","DOIUrl":"https://doi.org/10.1155/2010/128473","url":null,"abstract":"Single electron ionization of helium targets produced by the impact of\u0000fast proton beams is investigated. The postversion of the continuum distorted wave-eikonal\u0000initial state into a three-body approximation is reformulated, including the\u0000dynamic screening produced by the nonionized electron. This dynamic screening is\u0000shown to play a main role in the determination of double differential cross-sections. A\u0000good agreement is found with predictions obtained employing the prior version of the\u0000model, so that post-prior discrepancies are almost eliminated.","PeriodicalId":15106,"journal":{"name":"Journal of Atomic and Molecular Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2010-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89932474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We consider finite-range effects when the scattering length goes to zero near a magnetically controlled Feshbach resonance. The traditional effective-range expansion is badly behaved at this point, and we therefore introduce an effective potential that reproduces the full T-matrix. To lowest order the effective potential goes as momentum squared times a factor that is well defined as the scattering length goes to zero. The potential turns out to be proportional to the background scattering length squared times the background effective range for the resonance. We proceed to estimate the applicability and relative importance of this potential for Bose-Einstein condensates and for two-component Fermi gases where the attractive nature of the effective potential can lead to collapse above a critical particle number or induce instability toward pairing and superfluidity. For broad Feshbach resonances the higher order effect is completely negligible. However, for narrow resonances in tightly confined samples signatures might be experimentally accessible. This could be relevant for suboptical wavelength microstructured traps at the interface of cold atoms and solid-state surfaces.
{"title":"Effective Potential for Ultracold Atoms at the Zero Crossing of a Feshbach Resonance","authors":"N. Zinner","doi":"10.1155/2012/241051","DOIUrl":"https://doi.org/10.1155/2012/241051","url":null,"abstract":"We consider finite-range effects when the scattering length goes to zero near a magnetically controlled \u0000Feshbach resonance. The traditional effective-range expansion is badly behaved at this point, \u0000and we therefore introduce an effective potential that reproduces the full T-matrix. To lowest order \u0000the effective potential goes as momentum squared times a factor that is well defined as the scattering \u0000length goes to zero. The potential turns out to be proportional to the background scattering \u0000length squared times the background effective range for the resonance. \u0000We proceed to estimate the applicability and relative importance of this potential for Bose-Einstein condensates \u0000and for two-component Fermi gases \u0000where the attractive nature of the effective potential can lead to collapse above a critical particle number \u0000or induce instability toward pairing and superfluidity. For broad Feshbach resonances the higher order effect is \u0000completely negligible. However, for narrow resonances in tightly confined samples signatures might be \u0000experimentally accessible. This could be relevant for suboptical wavelength microstructured traps \u0000at the interface of cold atoms and solid-state surfaces.","PeriodicalId":15106,"journal":{"name":"Journal of Atomic and Molecular Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79551973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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