Ionization and dissociation processes of pyrrolidine in intense femtosecond laser field

Qiaoqiao Wang, Di Wu, Dongdong Zhang, Mingxing Jin, Fuchun Liu, Hang Liu, Zhan Hu, Dajun Ding*, Hirobumi Mineo, Yuri A. Dyakov, Yoshiaki Teranishi, Sheng Der Chao, A. M. Mebel, Sheng Hsien Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


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.

Original languageEnglish
Pages (from-to)11805-11815
Number of pages11
JournalJournal of Physical Chemistry C
Issue number27
StatePublished - 9 Jul 2009

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