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Near-threshold structure of molecular hydrogen at the 1s + 2l dissociation limit 分子氢在1s + 2l解离极限下的近阈值结构
High Resolution Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/hrs.1993.tha3
E. Eyler, B. F. Catching, N. Melikechi
{"title":"Near-threshold structure of molecular hydrogen at the 1s + 2l dissociation limit","authors":"E. Eyler, B. F. Catching, N. Melikechi","doi":"10.1364/hrs.1993.tha3","DOIUrl":"https://doi.org/10.1364/hrs.1993.tha3","url":null,"abstract":"High-resolution measurements of molecular structure very near a dissociation limit can be used both to probe long-range atomic interactions and to make accurate determinations of dissociation energies. Our research group has investigated the H(1s) + H(2s or 2p) dissociation limit in molecular hydrogen using optical double resonance with single-mode lasers. Fig. 1 shows the general scheme of the experiment. Our measurements of bound states in H2, reported in Ref. 1, have now been extended to include the adjoining continuum and the other stable isotopomers, HD and D2. The most weakly bound levels to which transitions are seen are bound by only about 0.03 cm−1, equivalent to about 40 mK. Very sharp continuum resonances are also observed in the region just above threshold.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"6 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":"122550819","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}
引用次数: 2
The Position, Shape, and Polarization Dependence of Resonances in the Laser Photoionization Spectrum of Aligned Ca 4s5p 1P1
High Resolution Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/hrs.1993.wb3
D. Duquette, K. Mclaughlin, D.S. Eschliman, O. Francis
{"title":"The Position, Shape, and Polarization Dependence of Resonances in the Laser Photoionization Spectrum of Aligned Ca 4s5p 1P1","authors":"D. Duquette, K. Mclaughlin, D.S. Eschliman, O. Francis","doi":"10.1364/hrs.1993.wb3","DOIUrl":"https://doi.org/10.1364/hrs.1993.wb3","url":null,"abstract":"Two-color spectroscopy using narrow-bandwidth pulsed lasers provides a powerful tool to study the near threshold photoionization spectrum of excited atomic states. By combining the energy and polarization selectivity afforded by pulsed dye lasers, it is possible to probe a number of different continua. Many of these would be unreachable from the ground state because of angular momentum and parity selection rules and also due to the lack of high resolution sources of photons at appropriate energies. Precise positions, shape profiles, and strengths of autoionizing resonances, as well as angular distributions of ejected photoelectrons are necessary for comparison with increasingly sophisticated calculations.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"121 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":"124019197","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}
引用次数: 0
High Resolution Electronic Spectroscopy of Hydroxyl-Rare Gas Complexes 羟基-稀有气体配合物的高分辨率电子光谱
High Resolution Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/hrs.1993.tua3
Bor-Chen Chang, J. Williamson, J. R. Dunlop, T. Miller
{"title":"High Resolution Electronic Spectroscopy of Hydroxyl-Rare Gas Complexes","authors":"Bor-Chen Chang, J. Williamson, J. R. Dunlop, T. Miller","doi":"10.1364/hrs.1993.tua3","DOIUrl":"https://doi.org/10.1364/hrs.1993.tua3","url":null,"abstract":"For many years, scientists have studied the spectroscopy of van der Waals complexes in past to understand intermolecular interactions and potential energy surfaces. There are abundant experiments and theoretical calculations on the closed-shell van der Waals complexes.1,2 Relatively speaking, the open-shell complexes have attracted much less attention until recently. The sparsity of information is due to both the difficulty of preparing the species and the complexity of their spectroscopy, which involves both unquenched electronic orbital and spin angular momenta. In the past four years, there have been several experimental and theoretical papers centered on Ar•OH/D and Ne•OH/D.3,4 However, except for one microwave experiment5 the previous works lack information about fine and hyperfine structure due to the resolution limit of dye laser used in the laser-induced fluorescence (LIF) studies.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"90 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":"121179090","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}
引用次数: 0
Infrared-Molecular Beam Spectroscopy: the Study of Weakly Bound Molecular Complexes as a Probe of Potential Energy Surfaces and Molecular Dynamics 红外分子束光谱:弱结合分子配合物作为势能表面和分子动力学探针的研究
High Resolution Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/hrs.1993.tua2
Roger E. Miller
{"title":"Infrared-Molecular Beam Spectroscopy: the Study of Weakly Bound Molecular Complexes as a Probe of Potential Energy Surfaces and Molecular Dynamics","authors":"Roger E. Miller","doi":"10.1364/hrs.1993.tua2","DOIUrl":"https://doi.org/10.1364/hrs.1993.tua2","url":null,"abstract":"Infrared laser spectroscopy has become a powerful tool in the study of weakly bound molecular complexes. The molecular constants obtained from these spectra can be used to determine the \"structure\" of the complex, for systems where this is a meaningful concept, while, in complexes which undergo wide amplitude excursions from their equilibrium geometries, the spectroscopy is often sensitive to the details of the intermolecular potential energy surface. In many cases, these spectra are sensitive to both the internal dynamics of the complex and the vibrational predissociation dynamics that result from the excitation process.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"51 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":"131552443","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}
引用次数: 0
High Resolution Spectroscopy of Ti2 and AlY at Near-Infrared Frequencies Ti2和AlY近红外高分辨光谱研究
High Resolution Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/hrs.1993.pd4
C. A. Arrington, Jon D. Langenberg, J. C. Pinegar, M. Morse, M. Doverstål, B. Lindgren, U. Sassenberg
{"title":"High Resolution Spectroscopy of Ti2 and AlY at Near-Infrared Frequencies","authors":"C. A. Arrington, Jon D. Langenberg, J. C. Pinegar, M. Morse, M. Doverstål, B. Lindgren, U. Sassenberg","doi":"10.1364/hrs.1993.pd4","DOIUrl":"https://doi.org/10.1364/hrs.1993.pd4","url":null,"abstract":"High resolution jet-cooled molecular beam spectroscopy has been effective in revealing the bonding between transition metals. One periodic trend that has developed during the study of small transition metal molecules is the relatively weak bond strength in the early 3d transition metals (Sc2, Ti2 in comparison to middle (V2, Cr2) or late (Ni2, Cu2) members of the 3d series. This trend of bond strengths in early transition metals is not so pronounced in the 4d and 5d metals where d-bonding is a major contributor to molecular stability. Low bond strengths in molecules, whether due to poor d overlap or high s ← d promotion energy, provides a challenge to the spectroscopist. It has been shown that diatomic systems with a large density of electronic states, as is usually the case for open d-subshell molecules, undergo a rapid predissociation (τ < 5 ns) when excited above the lowest dissociation limit.1 The extreme density of states responsible for predissociation also precludes isolation of single rovibronic states suitable for high resolution spectroscopy at energies near the dissociation limit of these molecules. The spectroscopist interested in investigating species with low bond strengths and high densities of electronic states, as in our investigation of Ti2 and AlY, is forced to search the low energy near-infrared region for isolated electronic states that are not hopelessly perturbed. In the present near-infrared investigation of Ti2 and AlY we have employed resonant two photon ionization (R2PI) as the detection strategy for obtaining optical spectra in a jet-cooled molecular beam.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"19 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":"128365200","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}
引用次数: 0
High Resolution Spectroscopy on Single Molecules 单分子的高分辨率光谱学
High Resolution Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/hrs.1993.wa5
J. Sepioł, F. Güttler, M. Pirotta, A. Renn, U. Wild
{"title":"High Resolution Spectroscopy on Single Molecules","authors":"J. Sepioł, F. Güttler, M. Pirotta, A. Renn, U. Wild","doi":"10.1364/hrs.1993.wa5","DOIUrl":"https://doi.org/10.1364/hrs.1993.wa5","url":null,"abstract":"Single particle spectroscopy has become a source of valuable information on fundamental interactions between light and matter. Whereas trapping and cooling of ions and atoms has been sucessfully achieved, single molecules, because of their multilevel structure (high number of internal degrees of freedom) have not been observed in electromagnetic traps so far. However due to the presence of zero phonon lines in conjunction with inhomogeneous broadening the spectroscopic isolation and detection of single molecules ‘trapped in solids at very low temperatures' is made feasible [1,2]. Single molecule spectroscopy allows to study the distribution of molecular properties and not only the statistical average which is generally observed.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"58 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":"134327952","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}
引用次数: 0
Molecular collisions at very low temperature 分子在低温下的碰撞
High Resolution Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/hrs.1993.tua5
F. D. De Lucia
{"title":"Molecular collisions at very low temperature","authors":"F. D. De Lucia","doi":"10.1364/hrs.1993.tua5","DOIUrl":"https://doi.org/10.1364/hrs.1993.tua5","url":null,"abstract":"We have reported a number of investigations in which a newly developed collisional cooling method was used to investigate collisional processes between gas phase atoms and molecules at very low temperatures.1-7 In these studies the molecules are effectively in thermodynamic equilibrium with their collision partners, but at temperatures far below their freezing points. Used in conjunction with conventional equilibrium cells, measurements over the entire 1 - 1000 K region can be made. This range makes possible both the observation of new collision phenomena at low temperature and the study of collisions over a wide enough range to consider the collisions spectroscopically.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"13 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":"124592120","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}
引用次数: 0
b-Dipole Transitions in X ˜ 2A' t-HOCO Observed by FIR Laser Magnetic Resonance 用FIR激光磁共振观察X ~ 2A′t-HOCO中的b-偶极子跃迁
High Resolution Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/hrs.1993.thb1
T. Sears, H. Radford, M. Moore
{"title":"b-Dipole Transitions in X ˜ 2A' t-HOCO Observed by FIR Laser Magnetic Resonance","authors":"T. Sears, H. Radford, M. Moore","doi":"10.1364/hrs.1993.thb1","DOIUrl":"https://doi.org/10.1364/hrs.1993.thb1","url":null,"abstract":"The HOCO radical is crucially important in combustion chemistry as the intermediate in the reaction between hydroxyl radicals and carbon monoxide. Studies of the temperature dependence of the rate constant for this reaction implied the existence of the radical intermediate1 but only very recently was HOCO detected in the gas phase2,3. Both the infrared spectrum3, which is due to the perturbed C=O stretching fundamental (v2), and the observed rotational spectrum2 consist only of a-dipole transitions. Such transitions obey the selection rule ΔKa = 0 in this near prolate top rotor and as such contain no direct information on the spacings between energy levels of different Ka. The high precision of the millimeter wave data allowed an approximate value for the A rotational constant to be derived2 however the accuracy with which it is known is much less than for B and C. Nonetheless, when combined with data for DOCO, it was possible to unequivocally attribute the spectra as due to the trans- geometrical isomer of the radical2.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"34 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":"128066573","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}
引用次数: 0
Molecular Spectroscopy at Ultracold Temperatures 超低温下的分子光谱学
High Resolution Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/hrs.1993.pd12
K. Helmerson, M. Wagshul, P. Lett, S. Rolston, W. Phillips
{"title":"Molecular Spectroscopy at Ultracold Temperatures","authors":"K. Helmerson, M. Wagshul, P. Lett, S. Rolston, W. Phillips","doi":"10.1364/hrs.1993.pd12","DOIUrl":"https://doi.org/10.1364/hrs.1993.pd12","url":null,"abstract":"Associative ionization (AI) in sodium (Na + Na + 2 hv → Na2+ + e−) has been a convenient reaction in which to study excited state collisions under \"ultracold\" conditions (≤1 mK) because the reaction product is easily identified and collected with high signal-to-noise. Previous studies [1] have revealed evidence of molecular intermediate-state resonances under high-intensity laser conditions. Theoretical analysis [2] has associated this structure with singly- and doubly-excited Na2 intermediate states. In this work, we present a new technique utilizing a switched magneto-optical trap (MOT) to make clean measurements of the spectrum of associative ionization in a regime where we can identify the peaks as being associated with states of the Na2 molecule. In addition, our technique reveals new structure in the spectrum of AI versus laser frequency, pointing out the previously unappreciated importance of atomic hyperfine structure in the reaction.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"85 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":"132290612","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}
引用次数: 0
Bond Energies of Small Transition Metal Cation Clusters 小过渡金属阳离子团簇的键能
High Resolution Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/hrs.1993.pd2
L. Russon, Scott A. Heidecke, M. Birke, J. Conceição, P. Armentrout, M. Morse
{"title":"Bond Energies of Small Transition Metal Cation Clusters","authors":"L. Russon, Scott A. Heidecke, M. Birke, J. Conceição, P. Armentrout, M. Morse","doi":"10.1364/hrs.1993.pd2","DOIUrl":"https://doi.org/10.1364/hrs.1993.pd2","url":null,"abstract":"A new experimental apparatus has been constructed for photodissociation spectroscopy of transition metal-containing cations. redissociation thresholds for \u0000 \u0000 \u0000 \u0000 \u0000 Co\u0000 \u0000 2\u0000 +\u0000 \u0000 \u0000 \u0000 , \u0000 \u0000 \u0000 \u0000 \u0000 Co\u0000 \u0000 3\u0000 +\u0000 \u0000 \u0000 \u0000 , and \u0000 \u0000 \u0000 \u0000 \u0000 Ti\u0000 \u0000 2\u0000 +\u0000 \u0000 \u0000 \u0000 have been observed and values of 2.765 ± 0.001 eV, 2.086 ± 0.002 eV, and 2.435 ± 0.002 eV, respectively, have been determined for the bond energies for these species. These are in good agreement with results obtained by collision-induced dissociation (CID) experiments. Comparison of bond strengths obtained from the observation of predissociation thresholds with those obtained by non-optical methods, such as collision-induced dissociation and Knudsen cell mass spectrometry, have allowed criteria for the interpretation of a pre-dissociation threshold as a bond strength to be developed.","PeriodicalId":109383,"journal":{"name":"High Resolution Spectroscopy","volume":"83 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":"132388194","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}
引用次数: 0
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