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Singlet And Triplet n,π∗ Transitions of Jet-Cooled p-Benzoquinone 射流冷却对苯醌的单重态和三重态n，π *跃迁
Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/1994/72592
I. Suzuka, M. Sanekata, Mitsuo. Ito, N. Ohta
{"title":"Singlet And Triplet n,π∗ Transitions of Jet-Cooled p-Benzoquinone","authors":"I. Suzuka, M. Sanekata, Mitsuo. Ito, N. Ohta","doi":"10.1155/1994/72592","DOIUrl":"https://doi.org/10.1155/1994/72592","url":null,"abstract":"The fluorescence/phosphorescence excitation spectra, the dispersed fluorescence/phosphorescence spectra \u0000and the sensitized phosphorescence excitation spectrum have been measured for jet-cooled p-benzoquinone. \u0000The assignments of vibronic bands in the 1B1g(n-,π∗) ← 1Ag and 1Au(n+,π∗) ← 1Ag transitions \u0000have been definitely established. The phosphorescence spectra from vibronic levels of 3Au exhibit a \u0000feature of single vibronic level emission. The 3Au ← 1Ag transition was also vibrationally analyzed.","PeriodicalId":296295,"journal":{"name":"Laser Chemistry","volume":"27 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":"129804625","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: 4
The Small Molecule Limit of Infrared Multiphoton Dissociation: Collisional Effects in D2CO 红外多光子解离的小分子极限:D2CO中的碰撞效应
Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/LC.8.169
M. Berman, C. Moore
{"title":"The Small Molecule Limit of Infrared Multiphoton Dissociation: Collisional Effects in D2CO","authors":"M. Berman, C. Moore","doi":"10.1155/LC.8.169","DOIUrl":"https://doi.org/10.1155/LC.8.169","url":null,"abstract":"The infrared multiphoton excitation of D2CO was studied by monitoring infrared fluorescence from stretching modes of D2CO following excitation in the bending modes. The dependence of the infrared multiphoton dissociation yield on laser wavelength, on laser power, and on reactant and foreign gas pressures was also studied. Severe bottlenecks to excitation through the first few steps are found. Vibration-to-vibration transfer of a bending quantum from one excited D2CO molecule to another is a crucial step. \u0000Collision-induced changes of rotational quantum number must also play an important role.","PeriodicalId":296295,"journal":{"name":"Laser Chemistry","volume":"38 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":"128476537","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
Picosecond Spectroscopy of Photoreceptor Molecules 光感受器分子的皮秒光谱
Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/LC.6.269
F. Aussenegg, M. Lippitsch, M. Riegler
{"title":"Picosecond Spectroscopy of Photoreceptor Molecules","authors":"F. Aussenegg, M. Lippitsch, M. Riegler","doi":"10.1155/LC.6.269","DOIUrl":"https://doi.org/10.1155/LC.6.269","url":null,"abstract":"","PeriodicalId":296295,"journal":{"name":"Laser Chemistry","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":"129303867","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: 11
Varnish Ablation Control by Optical Coherence Tomography 光学相干层析成像控制清漆烧蚀
Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/2006/10647
M. Gora, P. Targowski, A. Rycyk, J. Marczak
{"title":"Varnish Ablation Control by Optical Coherence Tomography","authors":"M. Gora, P. Targowski, A. Rycyk, J. Marczak","doi":"10.1155/2006/10647","DOIUrl":"https://doi.org/10.1155/2006/10647","url":null,"abstract":"Preliminary results of the application of optical coherence tomography (OCT), in particular in its spectral mode (SOCT) to the control of a varnish ablation process, are presented. Examination of the ablation craters made with an Er:YAG laser allows optimization of the laser emission parameters controlling fluence with respect to efficiency and safety of the ablation process. Results of measurements of ablation crater depth as a function of the number of pulses for a given fluence are presented for selected resins. This validates the applicability of SOCT to calibration of ablation conditions for the particular laser-varnish-paint layer combinations, and of its usage in planning the varnish ablation procedure. These results also imply that a review of conventional ablation thresholds is called for. Applicability of the SOCT technique to contemporaneous in situ monitoring of the range of varnish ablation is discussed.","PeriodicalId":296295,"journal":{"name":"Laser Chemistry","volume":"127 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":"129740817","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: 38
Competition Between Intramolecular Vibrational Energy Re-Distribution and Unimolecular Dissociation: A Scattering Theoretical Point of View 分子内振动能量再分配与单分子解离之间的竞争:一个散射理论的观点
Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/1995/59696
K. Someda, Hiroki Nakamura, F. Mies
{"title":"Competition Between Intramolecular Vibrational Energy Re-Distribution and Unimolecular Dissociation: A Scattering Theoretical Point of View","authors":"K. Someda, Hiroki Nakamura, F. Mies","doi":"10.1155/1995/59696","DOIUrl":"https://doi.org/10.1155/1995/59696","url":null,"abstract":"Systematic behavior of decay rates of resonances above dissociation threshold is investigated by using the theory of resonance scattering. The condition for the Rice-Ramsperger-Kassel-Marcus (RRKM) rate formula to be valid is clarified by analyzing the random model of unimolecular dissociation. The decay rate averaged over many resonances agrees with the RRKM rate when the mean spacing and the mean width of the resonance states coincide with each other. On the other hand, auto- and mutual-correlation functions of the non-stationary wave functions indicate a rather paradoxical and intriguing phenomenon: In the RRKM regime, insufficient time is left for intramolecular vibrational energy redistribution (IVR) before dissociation.","PeriodicalId":296295,"journal":{"name":"Laser Chemistry","volume":"145 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":"123517312","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: 3
IR Laser-Induced Changes to L-adrenaline-D-hydrogentartrate Incorporated in KBr Matrices 红外激光诱导KBr基质中l -肾上腺素- d -氢庆大酸盐掺入的变化
Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1080/02786270215156
T. Jovanovic, M. Bogavac, B. Radak, M. Trtica
{"title":"IR Laser-Induced Changes to L-adrenaline-D-hydrogentartrate Incorporated in KBr Matrices","authors":"T. Jovanovic, M. Bogavac, B. Radak, M. Trtica","doi":"10.1080/02786270215156","DOIUrl":"https://doi.org/10.1080/02786270215156","url":null,"abstract":"Changes in the pharmaceutical L-adrenaline-D-hydrogentartrate, incorporated in KBr matrices, induced by a pulsed carbon-dioxide Transversely Excited Atmospheric (TEA) laser, were observed. Modifications of the sample were monitored via infrared spectra. Special attention was devoted to the dependence of the sample changes on the laser energy density used. The irradiation of the pharmaceutical has been performed with two laser lines at wavelengths of about 10.6 µm. The laser lines coincide well with the absorption band of the pharmaceutical, which is assigned to the ring vibrations/out-of-plane OH deformation vibrations, within the carboxyl (COOH) group of L-adrenaline-D-hydrogentartrate. Laser energy densities of 1.20 and 1.70 J/cm2 modified the pharmaceutical/compound. It was found that this modification is in essence a thermal effect. The level of change showed a dependence on the laser energy density, number of accumulated laser pulses and temporal shape of the pulse.","PeriodicalId":296295,"journal":{"name":"Laser Chemistry","volume":"7 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":"121212533","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
Rotational Analysis of the Rydberg Spectrum of Water 水的Rydberg光谱的旋转分析
Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/LC.11.253
M. Child, R. D. Gilbert, C. Jungen
{"title":"Rotational Analysis of the Rydberg Spectrum of Water","authors":"M. Child, R. D. Gilbert, C. Jungen","doi":"10.1155/LC.11.253","DOIUrl":"https://doi.org/10.1155/LC.11.253","url":null,"abstract":"Two techniques for rotational analysis of the nd←1b1 Rydberg spectra of H2O and D2O are discussed—a \u0000Coriolis coupled asymmetric top model for the room temperature 3d←1b1 cluster, and an extension of \u0000multichannel quantum defect theory to asymmetric tops, which is applied to recent jet cooled photoionization \u0000spectra of the nd←1b1 series converging to the (100) vibrational levels of H2O","PeriodicalId":296295,"journal":{"name":"Laser Chemistry","volume":"39 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114113866","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: 3
Ultraviolet Laser Photoablation of Polymers: A Review and Recent Results 聚合物的紫外激光光烧蚀研究进展及最新成果
Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/1989/18750
S. Lazare, V. Granier
{"title":"Ultraviolet Laser Photoablation of Polymers: A Review and Recent Results","authors":"S. Lazare, V. Granier","doi":"10.1155/1989/18750","DOIUrl":"https://doi.org/10.1155/1989/18750","url":null,"abstract":"The evolution since 1982, of far-UV laser photoablation of polymers is described. The experimental data can be fitted by using a dynamic model which states that the irradiated interface moves at a rate proportional to the difference between, the intensity reaching it, and the ablation threshold intensity It. The screening effect of the ablated gaseous products is taken into account. The experimental etch depth versus fluence, obtained with our new quartz crystal microbalance technique, can be fitted by adjusting two parameters of this model; the mean absorption coefficient of the products β and the so-called ablation rate constant k, which is the etch rate for I=It","PeriodicalId":296295,"journal":{"name":"Laser Chemistry","volume":"79 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":"114311470","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: 167
Photodissociation Dynamics of Arn Arn的光解动力学
Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/1994/98627
T. Nagata
{"title":"Photodissociation Dynamics of Arn","authors":"T. Nagata","doi":"10.1155/1994/98627","DOIUrl":"https://doi.org/10.1155/1994/98627","url":null,"abstract":"The time-of-flight (TOF) spectra of Ar+ and Ar fragments produced in the photodissociation of Arn","PeriodicalId":296295,"journal":{"name":"Laser Chemistry","volume":"15 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":"121706919","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: 1
Modeling the Transient Changesin the Soret-Resonant RamanIntensities of Hemoglobin DuringThe R→ T Transition 血红蛋白R→T跃迁过程中索共振拉曼强度的瞬态变化建模
Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/1999/70916
T. Rush, R. Kumble, T. Spiro
{"title":"Modeling the Transient Changesin the Soret-Resonant RamanIntensities of Hemoglobin DuringThe R→ T Transition","authors":"T. Rush, R. Kumble, T. Spiro","doi":"10.1155/1999/70916","DOIUrl":"https://doi.org/10.1155/1999/70916","url":null,"abstract":"We have performed resonance Raman (RR) intensity calculations of the Soret-resonant Raman spectra of Ni and Zn Porphine to investigate observed core size intensity differences in the time-resolved Soret-resonant Raman (RR) spectra of hemoglobin. It was found that the metalloporphine intensities mainly derive from the expansion of the Cα—Cm and Cβ—Cβ bonds in the excited state, and that the observed differences are mainly due to the larger core-sized heme having a decreased Cα—Cm force constant and larger excited state porphyrin ring expansion.","PeriodicalId":296295,"journal":{"name":"Laser Chemistry","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":"121802478","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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