Yoon OK, Hwang WG, Choe JC, Kim MS
National Creative Research Initiative Center for Control of Reaction Dynamics and Department of Chemistry, Seoul National University, Seoul 151-742, Korea.
Rapid Commun Mass Spectrom. 1999;13(14):1515-21. doi: 10.1002/(SICI)1097-0231(19990730)13:14<1515::AID-RCM678>3.0.CO;2-R.
A technique to investigate photodissociation kinetics on a nanosecond time scale has been devised for molecular ions generated by multiphoton ionization (MPI) using mass-analyzed ion kinetic energy spectrometry. The branching ratio or rate constant has been determined for the photodissociation of the n-butylbenzene, bromobenzene, iodobenzene, and aniline molecular ions generated by MPI at 266 nm. The ion internal energies have been estimated by comparing the measured kinetic data with the previous energy dependence data. The analysis has shown that only those molecular ions generated by two-photon ionization contribute to the photodissociation signals. Around half of the available energy has been found to remain as molecular ion internal energy in the two-photon ionization process. Copyright 1999 John Wiley & Sons, Ltd.
已设计出一种技术，用于研究利用质量分析离子动能谱通过多光子电离（MPI）产生的分子离子在纳秒时间尺度上的光解离动力学。已确定了266 nm下由MPI产生的正丁基苯、溴苯、碘苯和苯胺分子离子光解离的分支比或速率常数。通过将测得的动力学数据与先前的能量依赖性数据进行比较，估算了离子内能。分析表明，只有那些通过双光子电离产生的分子离子对光解离信号有贡献。已发现，在双光子电离过程中，约一半的可用能量作为分子离子内能保留下来。版权所有1999约翰·威利父子有限公司。
