Laser Chemistry最新文献_第5页

Chemical Reactions in Solution: The New Photochemistry 溶液中的化学反应:新的光化学

Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/LC.3.163

G. Robinson, W. Jalenak

{"title":"Chemical Reactions in Solution: The New Photochemistry","authors":"G. Robinson, W. Jalenak","doi":"10.1155/LC.3.163","DOIUrl":"https://doi.org/10.1155/LC.3.163","url":null,"abstract":"Understanding the dynamics of chemical reactions in the condensed phase reaches a \u0000new plateau with each technological advance in time-resolved spectroscopy. Submicrosecond \u0000studies of the past revealed the role of long range molecular diffusion in \u0000condensed-phase chemistry and photochemistry. The picosecond (10−12–10−9 s) time \u0000scale, combined with the use of a high concentration of reactants, can provide new \u0000information about the “microdynamics” in the local region of the reaction itself. The \u0000role of solvent is particularly important: how it attaches to an activated reactant \u0000molecule, how it is displaced by the other reactant molecule preparatory to reaction, \u0000and how the solvent behavior affects the dynamics of single- and multi-channel \u0000processes, thus the relative yields of products in competing reactions. The theory \u0000presented here divides itself into two types: one that depends on a diffusion equation \u0000that also contains terms describing a distance-dependent reaction sink function and a \u0000reaction barrier; and a second type that deals phenomenologically with rate equations, \u0000including the rate of reactant/solvent interchange. Experiments subdivide naturally \u0000into steady state and transient measurements, the former dealing with quantum yields \u0000and steady state spectroscopic studies, the latter with picosecond transient spectroscopy. \u0000The two theoretical approaches can be interrelated in certain useful limits. The two \u0000types of experimental data, in combination with the theory, supply fundamental \u0000information about solvent participation in the local reaction region.","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":"124922737","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

DYNAMICS OF QUANTUM SELECTED LEVELS OF ELECTRONIC EXCITED STATES OF SMALL MOLECULES 小分子电子激发态量子选择能级的动力学

Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/LC.11.279

E. Martínez, M. R. López, F. Basterrechea, P. Puyuelo

引用次数: 4

Question of mode-specificity in unimolecular reaction dynamics 单分子反应动力学中的模式特异性问题

Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/LC.2.243

W. Miller

引用次数: 6

The Role of Molecular Complexes in a Hollow-Cathode CW HeCd 分子配合物在空心阴极连续波HeCd中的作用

Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/1993/17687

H. Telle, C. G. Morgan, S. Acosta-Ortiz, Karyono

引用次数: 2

MOLECULAR RESONANCES OBSERVED IN THE PREDISSOCIATION OF Csz Csz预解离过程中观察到的分子共振

Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/1995/79063

Bong-Soo Kim, K. Yoshihara

引用次数: 1

Stereodynamical Studies of Velocity Aligned Photofragments 速度对准光碎片的立体动力学研究

Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/LC.11.265

M. Brouard, S. Duxon, P. Enrı́quez, R. Sayós, J. Simons

引用次数: 6

The Spectroscopy of Transition States in H+H2 Reaction, and NaI Photodissociation H+H2反应过渡态光谱及NaI光解

Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/LC.2.229

H. Foth, H. R. Mayne, R. Poirier, J. Polanyi, H. Telle

引用次数: 7

UV Laser Decay of Oxygen-Deficient Centers in Silica Glasses 二氧化硅玻璃中缺氧中心的紫外激光衰减

Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/LC.12.211

V. Bagratashvili, S. Tsypina, S. Alimpiev, Ya. O. Simanovski, A. Prokhorov, A. O. Rybaltovski

引用次数: 5

Picosecond Absorption Spectra and Relaxation Processes of the Excited Singlet State of Pyrene in Solution 芘在溶液中激发态的皮秒吸收光谱和弛豫过程

Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/LC.1.357

H. Miyasaka, H. Masuhara, N. Mataga

{"title":"Picosecond Absorption Spectra and Relaxation Processes of the Excited Singlet State of Pyrene in Solution","authors":"H. Miyasaka, H. Masuhara, N. Mataga","doi":"10.1155/LC.1.357","DOIUrl":"https://doi.org/10.1155/LC.1.357","url":null,"abstract":"The method of analysis for the ps transient absorption spectra obtained by a \u0000ps Nd3+: YAG laser photolysis system is described in detail, showing the results of \u0000pyrene in solution. The S n ← S 1 spectrum observed immediately after excitation is rather broad and its intensity in the short wavelength region is relatively enhanced, compared to the spectrum observed at later stages. For elucidating this fast spectral change, the spectrum at 0 ps was simulated from that at 100 ps, evaluating numerically the inner filter effect, depletion of the ground state molecules and temporal characteristics of the monitoring ps continuum. The difference between the simulated and experimentally observed spectra may be ascribed to the nonlinear refractive index change of the solvent, the thermal lensing effect, or to an intrinsic relaxation of the excited molecule. Examining absorption spectra obtained under various conditions, the former two possibilities were denied for the excited pyrene system. Vibrational relaxation as well as the S2 → S1 internal conversion with a time constant of less than 10 ps have been suggested to be responsible for this difference between the simulated and observed spectra.","PeriodicalId":296295,"journal":{"name":"Laser Chemistry","volume":"53 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":"114569931","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: 83

Recent Advances in IR Laser Chemistry 红外激光化学研究进展

Laser Chemistry Pub Date : 1900-01-01 DOI: 10.1155/LC.2.335

A. Kaldor, R. Woodin, R. Hall

引用次数: 1