Timothy M. Cerny, X. Tan, J. Williamson, E. Robles, A. Ellis, T. Miller
The number of organometallic free radicals studied spectroscopically in the gas phase has been very limited until quite recently. Application of Broida oven, laser photolysis and laser photolysis/vaporization techniques to synthesize these transient species has significantly enlarged the number of reports over the past few years. This research group’s contribution to the area have been a series of reports by Robles, Ellis and Miller detailing electronic and vibrational structures (~.5 cm-1 resolution) of 15 species of the form M-R (M = Mg, Ca, Zn and Cd; R = cyclopentadienyl (Cp), pyrollyl (Py) and methylcyclopentadienyl (MCp)) and M-CH3 (M = Ca, Zn and Cd), many of them observed for the first time.1-8 These molecules are more than simply novel constructs. The methyl and Cp derivatives are recognized as important intermediates in metal deposition processes while the metal-Py species are found as subunits in several chemical substances of biological importance. Metal-ligand bonding sites, vibrational frequencies, spin-orbit splittings and barriers to internal rotation are some of the types of information that this work has yielded. To augment this work, a rotationally resolved study is presented here which confirms the electronic state symmetry assignments given in earlier studies, and more importantly, determines rotational constants and other interaction parameters of these radicals.
直到最近，在气相光谱中研究的有机金属自由基的数量一直非常有限。在过去的几年中，应用Broida烤箱、激光光解和激光光解/汽化技术合成这些瞬态物质的报道数量显著增加。该研究小组对该领域的贡献是Robles, Ellis和Miller的一系列详细的电子和振动结构报告(~)。M- r (M = Mg, Ca, Zn和Cd)形式的15种;R =环戊二烯基(Cp)、软热解基(Py)和甲基环戊二烯基(MCp))和M- ch3 (M = Ca、Zn和Cd)，其中许多是首次观察到的。这些分子不仅仅是新颖的结构。甲基和Cp衍生物被认为是金属沉积过程中重要的中间体，而金属- py物种被发现是几种具有重要生物学意义的化学物质的亚基。金属配体键位、振动频率、自旋轨道分裂和内部旋转障碍是这项工作产生的一些类型的信息。为了加强这项工作，本文提出了一个旋转分辨的研究，该研究证实了早期研究中给出的电子态对称分配，更重要的是，确定了这些自由基的旋转常数和其他相互作用参数。
{"title":"High Resolution Electronic Spectroscopy of ZnCH3 and CdCH3","authors":"Timothy M. Cerny, X. Tan, J. Williamson, E. Robles, A. Ellis, T. Miller","doi":"10.1063/1.465521","DOIUrl":"https://doi.org/10.1063/1.465521","url":null,"abstract":"The number of organometallic free radicals studied spectroscopically in the gas phase has been very limited until quite recently. Application of Broida oven, laser photolysis and laser photolysis/vaporization techniques to synthesize these transient species has significantly enlarged the number of reports over the past few years. This research group’s contribution to the area have been a series of reports by Robles, Ellis and Miller detailing electronic and vibrational structures (~.5 cm-1 resolution) of 15 species of the form M-R (M = Mg, Ca, Zn and Cd; R = cyclopentadienyl (Cp), pyrollyl (Py) and methylcyclopentadienyl (MCp)) and M-CH3 (M = Ca, Zn and Cd), many of them observed for the first time.1-8 These molecules are more than simply novel constructs. The methyl and Cp derivatives are recognized as important intermediates in metal deposition processes while the metal-Py species are found as subunits in several chemical substances of biological importance. Metal-ligand bonding sites, vibrational frequencies, spin-orbit splittings and barriers to internal rotation are some of the types of information that this work has yielded. To augment this work, a rotationally resolved study is presented here which confirms the electronic state symmetry assignments given in earlier studies, and more importantly, determines rotational constants and other interaction parameters of these radicals.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127413480","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}
G. Blake, K. L. Busarow, R. C. Cohen, K. Laughlin, Yuan‐Pern Lee, R. Saykally
Sub-Doppler far-infrared vibration-rotation-tunneling spectra of several water- and ammonia-containing clusters will be presented. Intermolecular potential energy surfaces derived from these spectra will also be discussed.
{"title":"Tunable Far-Infrared Laser Spectroscopy of Hydrogen Bonds","authors":"G. Blake, K. L. Busarow, R. C. Cohen, K. Laughlin, Yuan‐Pern Lee, R. Saykally","doi":"10.1063/1.455380","DOIUrl":"https://doi.org/10.1063/1.455380","url":null,"abstract":"Sub-Doppler far-infrared vibration-rotation-tunneling spectra of several water- and ammonia-containing clusters will be presented. Intermolecular potential energy surfaces derived from these spectra will also be discussed.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129505453","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}
Nearly-degenerate four-wave mixing (NDFWM) spectroscopy1 and the closely related tunable-laser-induced grating spectroscopies2 have proved to be valuable tools in the study of nonlinear optical interactions. The NDFWM spectral lineshape provides information concerning the lifetimes,3 and therefore the identities, of multiphoton scattering mechanisms. In addition to the great number of investigations in liquids and solids, considerable research has focused on wave-mixing in resonant atomic gases for phase conjugation applications.4 Although many special cases have been discussed, general expressions that include the effects of molecular motion for the NDFWM lineshape in gases have not been previously reported. The present study is motivated by an interest in understanding the mechanisms contributing to degenerate four-wave mixing (DFWM) spectroscopy in molecular gases for application to combustion and chemical physics research.
{"title":"Perturbative Nearly-Degenerate Four-Wave Mixing Lineshapes in Gases","authors":"L. Rahn","doi":"10.1364/hrs.1993.tub1","DOIUrl":"https://doi.org/10.1364/hrs.1993.tub1","url":null,"abstract":"Nearly-degenerate four-wave mixing (NDFWM) spectroscopy1 and the closely related tunable-laser-induced grating spectroscopies2 have proved to be valuable tools in the study of nonlinear optical interactions. The NDFWM spectral lineshape provides information concerning the lifetimes,3 and therefore the identities, of multiphoton scattering mechanisms. In addition to the great number of investigations in liquids and solids, considerable research has focused on wave-mixing in resonant atomic gases for phase conjugation applications.4 Although many special cases have been discussed, general expressions that include the effects of molecular motion for the NDFWM lineshape in gases have not been previously reported. The present study is motivated by an interest in understanding the mechanisms contributing to degenerate four-wave mixing (DFWM) spectroscopy in molecular gases for application to combustion and chemical physics research.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117065535","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}
P. Kumar, S. S. Harilal, Vpn Nampoori, C. Vallabhan
The collision cross section and broadening coefficient for 2p8 → 4d4. transition in neon has been evaluated by high resolution optogalvanic spectroscopy using a single mode ring dye laser.
2p8→4d4的碰撞截面和展宽系数。利用单模环形染料激光器，用高分辨光电光谱法研究了氖的跃迁。
{"title":"Measurement of Collision Cross Section and Line Broadening Coefficient for 2p8 → 4d4 Transition in Neon","authors":"P. Kumar, S. S. Harilal, Vpn Nampoori, C. Vallabhan","doi":"10.1364/hrs.1993.wb2","DOIUrl":"https://doi.org/10.1364/hrs.1993.wb2","url":null,"abstract":"The collision cross section and broadening coefficient for 2p8 → 4d4. transition in neon has been evaluated by high resolution optogalvanic spectroscopy using a single mode ring dye laser.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122906668","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}
Recent results have shown that highly vibrationally excited O2 is formed in significant quantities from the ultraviolet photolyis of ground state ozone. An important question for understanding the balance of O3 in the upper atmosphere is the lifetime of these highly vibrationally excited molecules which are proposed2 to be a photolytic source of odd oxygen atoms. In this work we report the rate constants for the collisional deactivation of SEP prepared O2(v"=18-25) by O2(v"=0), at temperatures of 295 and 395 K. The experiments are analogous to the "Pump", "Dump" and "Probe" studies carried out by Yang et al on NO.3 A pulsed tunable Argon Fluoride laser is used to "PUMP" O2 from X 3 Σ u − ground electronic state to a specific rovibrational level of the B 3 Σ g − excited electronic state via the well known Schumann-Runge bands4. A Xenon-Chloride pumped tunable dye laser system then stimulates, or "DUMPS" the O2 back to a specific excited rovibrational level of the ground electronic state. A second tunable dye laser system then "PROBES" the vibrationally excited O2 population by Laser Induced Fluorescence. By varying the time delay between the DUMP and PROBE lasers, the time dependant occupation of the prepared vibrational level is monitored. The collisional quenching rate constant for a given vibrational level is then determined from the pressure dependance of the lifetime. Implications of the measured rates for atmospheric chemical reactions are discussed.
最近的研究结果表明，基态臭氧的紫外光解作用形成了大量的高振动激发O2。要了解上层大气中臭氧的平衡，一个重要的问题是这些高度振动激发的分子的寿命，这些分子被认为是奇氧原子的光解源。本文报道了O2(v”=0)对O2(v”=18-25)制备的SEP在295和395 K下的碰撞失活速率常数。实验类似于Yang等人在NO.3上进行的“泵”、“转储”和“探针”研究，利用脉冲可调谐氟化氩激光器通过众所周知的Schumann-Runge波段，将O2从x3 Σ u -基电子态“泵”到b3 Σ g -激发态的特定旋转振动能级。然后，氙-氯化物泵浦可调谐染料激光系统刺激或“DUMPS”O2回到基电子状态的特定激发旋转振动水平。第二个可调谐染料激光系统然后通过激光诱导荧光“探测”振动激发的O2族。通过改变DUMP和PROBE激光器之间的时间延迟，可以监测制备的振动能级的时间依赖性占用。然后根据寿命的压力依赖性确定给定振动水平下的碰撞淬火速率常数。讨论了测量速率对大气化学反应的影响。
{"title":"Stimulated Emission Pumping (SEP)1 Studies of Energy Transfer in Highly Vibratonally Excited Oxygen","authors":"J. A. Mack, J. Price, A. Wodtke","doi":"10.1364/hrs.1993.mb5","DOIUrl":"https://doi.org/10.1364/hrs.1993.mb5","url":null,"abstract":"Recent results have shown that highly vibrationally excited O2 is formed in significant quantities from the ultraviolet photolyis of ground state ozone. An important question for understanding the balance of O3 in the upper atmosphere is the lifetime of these highly vibrationally excited molecules which are proposed2 to be a photolytic source of odd oxygen atoms. In this work we report the rate constants for the collisional deactivation of SEP prepared O2(v\"=18-25) by O2(v\"=0), at temperatures of 295 and 395 K. The experiments are analogous to the \"Pump\", \"Dump\" and \"Probe\" studies carried out by Yang et al on NO.3 A pulsed tunable Argon Fluoride laser is used to \"PUMP\" O2 from \u0000 \u0000 \u0000 \u0000 X\u0000 3\u0000 \u0000 \u0000 Σ\u0000 u\u0000 −\u0000 \u0000 \u0000 \u0000 ground electronic state to a specific rovibrational level of the \u0000 \u0000 \u0000 \u0000 B\u0000 3\u0000 \u0000 \u0000 Σ\u0000 g\u0000 −\u0000 \u0000 \u0000 \u0000 excited electronic state via the well known Schumann-Runge bands4. A Xenon-Chloride pumped tunable dye laser system then stimulates, or \"DUMPS\" the O2 back to a specific excited rovibrational level of the ground electronic state. A second tunable dye laser system then \"PROBES\" the vibrationally excited O2 population by Laser Induced Fluorescence. By varying the time delay between the DUMP and PROBE lasers, the time dependant occupation of the prepared vibrational level is monitored. The collisional quenching rate constant for a given vibrational level is then determined from the pressure dependance of the lifetime. Implications of the measured rates for atmospheric chemical reactions are discussed.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128151123","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}
H. Hwang, A. Van Orden, Keiichi Tanaka, E. Kuo, J. Heath, R. Saykally
Carbon clusters have been of interest for many years due to their astrophysical importance and their role in the chemistry of high temperature, carbon-rich environments.1 Recent experimental and theoretical studies have been highly successful in elucidating the structure and bonding of small carbon clusters containing an odd number of atoms. The picture which has emerged is that odd clusters of three to nine atoms possess linear ground electronic states with cumulenic bonding. One of the most fascinating characteristics of these odd clusters is their unusual bending motion. C3, for example, has long been known to possess an extraordinarily low frequency, high amplitude bending mode, and indeed all of these linear chains are characterized by low bending frequencies.
{"title":"Infrared Laser Spectroscopy of Jet-Cooled Carbon Clusters: The Structure and Spectroscopy of 3Σ c6","authors":"H. Hwang, A. Van Orden, Keiichi Tanaka, E. Kuo, J. Heath, R. Saykally","doi":"10.1364/hrs.1993.tha2","DOIUrl":"https://doi.org/10.1364/hrs.1993.tha2","url":null,"abstract":"Carbon clusters have been of interest for many years due to their astrophysical importance and their role in the chemistry of high temperature, carbon-rich environments.1 Recent experimental and theoretical studies have been highly successful in elucidating the structure and bonding of small carbon clusters containing an odd number of atoms. The picture which has emerged is that odd clusters of three to nine atoms possess linear ground electronic states with cumulenic bonding. One of the most fascinating characteristics of these odd clusters is their unusual bending motion. C3, for example, has long been known to possess an extraordinarily low frequency, high amplitude bending mode, and indeed all of these linear chains are characterized by low bending frequencies.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115759846","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 selfconsistent framework for study of the surface electronic structure of finite superlattices has been proposed. Our emphasis is on the influence of accumulation or depletion layer on the surface states (Tamm states). We have used a modulated doping profile, including an accumulation or a depletion surface layer, in our selfconsistent calculations of potential and carrier density profile. We have found the existence of Tamm states above(depletion layer) or below(accumulation layer) the superlattice miniband. One of the Tamm states found crosses the Fermi energy in the energy gap when the depletion effect, resulting from dangling bonds, defects, impurities, etc, near the surface increases. In our case, near the top layer of the superlattice the depletion region was formed as a result of the pinning of the Fermi level below its position in intrinsic GaAs due to the midgap surface states.
{"title":"Electronic Surface State and Plasmon-Phonon Coupled Excitations at the surface of Modulation-doped GaAs/AlGaAs Multiquantum Wells: A Study of High-Resolution Electron-Energy-Loss Spectroscopy(HREELS)","authors":"R. Yu","doi":"10.1364/hrs.1993.mb7","DOIUrl":"https://doi.org/10.1364/hrs.1993.mb7","url":null,"abstract":"A selfconsistent framework for study of the surface electronic structure of finite superlattices has been proposed. Our emphasis is on the influence of accumulation or depletion layer on the surface states (Tamm states). We have used a modulated doping profile, including an accumulation or a depletion surface layer, in our selfconsistent calculations of potential and carrier density profile. We have found the existence of Tamm states above(depletion layer) or below(accumulation layer) the superlattice miniband. One of the Tamm states found crosses the Fermi energy in the energy gap when the depletion effect, resulting from dangling bonds, defects, impurities, etc, near the surface increases. In our case, near the top layer of the superlattice the depletion region was formed as a result of the pinning of the Fermi level below its position in intrinsic GaAs due to the midgap surface states.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117087633","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}
Eileen M. Spain, Christopher J. Smith, M. Dalberth, S. Leone
The nature of atomic collisions can be revealed through the preparation and probing of aligned or oriented states. Intense interest in this research topic is evident by the numerous current experimental and theoretical investigations.1 The results of these studies provide a means of visualizing the important mechanisms and symmetries of the collision process with unprecedented detail.
{"title":"Laser Preparation and Probing of Initial and Final Angular Momentum States in the Collision-Induced Energy Transfer Ca (4s4p 3P1) + He → Ca (4s4p 3P2) + He","authors":"Eileen M. Spain, Christopher J. Smith, M. Dalberth, S. Leone","doi":"10.1364/hrs.1993.thb4","DOIUrl":"https://doi.org/10.1364/hrs.1993.thb4","url":null,"abstract":"The nature of atomic collisions can be revealed through the preparation and probing of aligned or oriented states. Intense interest in this research topic is evident by the numerous current experimental and theoretical investigations.1 The results of these studies provide a means of visualizing the important mechanisms and symmetries of the collision process with unprecedented detail.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127261179","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}
Carbenes are a significant trace constituent of the gas in the interstellar medium (and in the expanding shell around at least one star), representing about one-sixth of the molecular species that have been identified in space. The identification of one of the most abundant and widespread interstellar carbenes, the cyclopropenylidene ring, C3H2, is described, together with recent laboratory work on the excited vibrational states of this molecule and on the geometrical structure of one of its isomers, the carbon chain carbene H2C3. A number of additional free carbines which might be detected in space are considered. There are at least two reasons why carbenes are comparatively conspicuous in astronomical sources relative to other reactive molecules: one is their high polarity; a second is their production via the same ion-molecule reactions that make known stable species in space (or very similar reactions). Finally, it is pointed out that cumulene carbon chains somewhat longer than those so far detected in space are promising candidates for the carriers of the interstellar optical diffuse bands.
{"title":"Carbenes in the Interstellar Gas","authors":"P. Thaddeus","doi":"10.1364/hrs.1993.tha1","DOIUrl":"https://doi.org/10.1364/hrs.1993.tha1","url":null,"abstract":"Carbenes are a significant trace constituent of the gas in the interstellar medium (and in the expanding shell around at least one star), representing about one-sixth of the molecular species that have been identified in space. The identification of one of the most abundant and widespread interstellar carbenes, the cyclopropenylidene ring, C3H2, is described, together with recent laboratory work on the excited vibrational states of this molecule and on the geometrical structure of one of its isomers, the carbon chain carbene H2C3. A number of additional free carbines which might be detected in space are considered. There are at least two reasons why carbenes are comparatively conspicuous in astronomical sources relative to other reactive molecules: one is their high polarity; a second is their production via the same ion-molecule reactions that make known stable species in space (or very similar reactions). Finally, it is pointed out that cumulene carbon chains somewhat longer than those so far detected in space are promising candidates for the carriers of the interstellar optical diffuse bands.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130569260","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}
Several experimental and theoretical studies [1,2,3] of Surface Plasmons Enhanced Raman Scattering (SPERS) in Kretschmann geometry (prism-metal-dielectric stacks) have demonstrated that it is possible to use surface plasmons (SP) to enhance Raman scattering from molecules adsorbed on a metal film. The enhancement process originates from two contributions: First, excitation of SP at pump frequency (ωi) and second, excitation of SP at Stokes frequency (ωs). To get the strongest Raman signal, scattered light must be detected on the prism side [3]. Indeed, the collected light comes from the outcoupling of SP at the Stokes frequency. In an experiment of SPERS, the Raman intensity depends on the distance of the active molecules to the metal surface [2]. Moreover, it has been suggested [3] that the thickness of the metal film deposited onto the prism should also be taken into account if one wants to improve the limit of detection.
{"title":"Optimization of Raman Signal Enhancement in Kretschmann Configuration","authors":"N. Primeau, J. Coutaz, L. Abello","doi":"10.1364/hrs.1993.wa4","DOIUrl":"https://doi.org/10.1364/hrs.1993.wa4","url":null,"abstract":"Several experimental and theoretical studies [1,2,3] of Surface Plasmons Enhanced Raman Scattering (SPERS) in Kretschmann geometry (prism-metal-dielectric stacks) have demonstrated that it is possible to use surface plasmons (SP) to enhance Raman scattering from molecules adsorbed on a metal film. The enhancement process originates from two contributions: First, excitation of SP at pump frequency (ωi) and second, excitation of SP at Stokes frequency (ωs). To get the strongest Raman signal, scattered light must be detected on the prism side [3]. Indeed, the collected light comes from the outcoupling of SP at the Stokes frequency. In an experiment of SPERS, the Raman intensity depends on the distance of the active molecules to the metal surface [2]. Moreover, it has been suggested [3] that the thickness of the metal film deposited onto the prism should also be taken into account if one wants to improve the limit of detection.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121559842","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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