標題: Neutral-Fragmentation Paths of Methane Induced by Intense Ultrashort IR Laser Pulses: Ab Initio Molecular Orbital Approach
作者: Koseki, Shiro
Shimakura, Noriyuki
Teranishi, Yoshiaki
Lin, Sheng Hsien
Fujimura, Yuichi
應用化學系分子科學碩博班
物理研究所
Institute of Molecular science
Institute of Physics
公開日期: 17-一月-2013
摘要: Instantaneous (laser-field-dependent) potential energy curves leading to neutral fragmentations of methane were calculated at several laser intensities from 1.4 x 10(13) to 1.2 x 10(14) W/cm(2) (from 1.0 x 10(10) to 3.0 X 10(10) V/m) using ab initio molecular orbital (MO) methods to validate the observation of neutral fragmentations induced by intense femtosecond IR pulses (Kong et al. J. Chem. Phys. 2006, 125, 133320). Two fragmentation paths, CH2 + 2H and CH2 + H-2, in T-1(2) superexcited states that are located in the energy range of 12-16 eV were considered as the reaction paths because these states are responsible for Jahn-Teller distortion opening up reaction paths during ultrashort pulses. As field intensity increased, the low-lying excited (1)A(1) states originated from the Jahn-Teller T-1(2) states were substantially stabilized along the neutral-fragment path CH4 -> CH2 + 2H and were located below the ionization threshold. On the other hand, the low-lying excited B-1(1) states, which also originate from the Jahn-Teller T-1(2) states, were embedded on the ionized state along the dissociation path to CH2 + H-2. This indicates that ionic fragments, rather than neutral ones, are produced along the CH2 + H-2 path. The computational results support neutral fragmentations through superexcited states proposed by Kong et al.
URI: http://dx.doi.org/10.1021/jp309931c
http://hdl.handle.net/11536/21038
ISSN: 1089-5639
DOI: 10.1021/jp309931c
期刊: JOURNAL OF PHYSICAL CHEMISTRY A
Volume: 117
Issue: 2
起始頁: 333
結束頁: 341
顯示於類別:期刊論文


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