標題: Ionization and Dissociation Processes of Pyrrolidine in Intense Femtosecond Laser Field
作者: Wang, Qiaoqiao
Wu, Di
Zhang, Dongdong
Jin, Mingxing
Liu, Fuchun
Liu, Hang
Hu, Zhan
Ding, Dajun
Mineo, Hirobumi
Dyakov, Yuri A.
Teranishi, Yoshiaki
Chao, Sheng Der
Mebel, A. M.
Lin, Sheng Hsien
應用化學系
Department of Applied Chemistry
公開日期: 9-七月-2009
摘要: Ionization and dissociation mechanisms of pyrrolidine in intense 800 nm laser field (10(13) to 10(14) W/cm(2)) have been experimentally investigated by using a method of molecular beam and time-of-flight mass spectrometer. Singly charged parent ion and numerous fragment ions are observed in the mass spectra, which are investigated as a function of laser intensity and polarization. In order to understand the details of the ionization processes of pyrrolidine in intense femtosecond laser field, we quantitatively calculate the rate constants and ion yields by means of generalized Keldysh-Faisal-Reiss theory, and the excitation probabilities of the excited states are also calculated by using Floquet theory. The results suggest that the ionization might occur partially through the excited states of neutral pyrrolidine. Comparing with linearly polarized (LP) laser field, we observe some enhancement of fragmentation with a circularly polarized (CP) laser field above the saturation threshold intensity which might be explained by the active energies of the pyrrolidine molecular ions are different under CP and LP laser irradiated. To interpret the dissociation patterns of the pyrrolidine ions, we have used the Rice-Ramsperger-Kassel-Marcus theory with the potential surfaces obtained from the ab initio quantum chemical calculations.
URI: http://dx.doi.org/10.1021/jp901857k
http://hdl.handle.net/11536/6974
ISSN: 1932-7447
DOI: 10.1021/jp901857k
期刊: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 113
Issue: 27
起始頁: 11805
結束頁: 11815
顯示於類別:期刊論文


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