Time-resolved resonance Raman spectroscopy of photobiological and photochemical transients-猫眼课题宝

光生物和光化学瞬态的时间分辨共振拉曼光谱

DOI：

10.1021/ar00119a002

发表时间：

1985

期刊：

Accounts of Chemical Research

影响因子：

18.3

通讯作者：

中科院分区：

化学1区

文献类型：

作者：

J. Terner;M. El

One of the fundamental topics in chemistry is the study of molecular structural changes which occur during the course of a chemical reaction. Muchof the knowledge of the mechanisms involvedin chemical change has come through the study of photochemical processes, using techniques such as flash photolysis. As was shown byNorrish and Porter1 in the 1940s, by initiating a chemical process with a strong photolytic flash, and following the resulting changes with a weak probe, it was possible to obtain the optical absorption spectra of short-lived chemical transients and to de-termine rates of rapid processes. Short duration flashlamps available at that time allowed the study of chemical mechanisms with microsecond time resolution. The advent of pulsedlasers in the 1960s resulted in routine acquisition of kinetic data on the order of na-noseconds. 2 Laser modelocking and pulse compression presently allow investigations of events in the picose-cond3 and subpicosecond4 timescales. The strength of flash photolysis and related techniques, such as stopped flow5 and temperature jump6 kinetics (methods which provide transient absorption spectra) is the ability to derive kinetic rate information. The enormous potential of these techniques has been proven. A greatdeal of chemical information can be obtained from transient absorptions. Nonetheless, in many instances absorption bands are broad and diffuse with limited inherent structural information. Other spectroscopic techniques such as Raman and infrared absorption spectroscopy can produce high resolution vibrational spectra. Combining theprinciples of flash photolysis with Raman spectroscopy results in a pow-erful method for obtaining detailed information about changes in structure and bonding within a molecule.