Angular distributions of photo-fragment ions of CH3OH molecules in the femtosecond laser fields

doi:10.3969/j.issn.1000-5641.2015.01.022

Abstract

Abstract: The multi-photon dissociation and coulomb explosion of methanol in the femtosecond laser field have been investigated by dc-slice imaging technique combined with time of flight mass spectroscopy. Time of flight mass spectroscopy and sliced images of fragment ions were obtained, and the kinetic energy release and angular distributions of photo-fragment ions were also measured. The kinetic energy release of CH₂⁺,H₂O⁺ and CH₃⁺,OH⁺ meet the conservation of momentum, it is proved that they come from process of Coulomb explosion. Based on the comparison of the migration pathway and non-migration pathway from the C-O bond cleavage, the intensity dependence of the anisotropy parameter a₂and cos²θ values for each channel were calculated, which indicated the dynamic molecular alignments of methanol in the femtosecond laser fields dominates.

Key words: femtosecond laser, angular distribution, molecule alignment

CLC Number:

O437

FAN Qing-Fei, YANG Yan, WU Hua, ZHOU Bin, WANG Xiao, TENG Chong, SUN Zhen-Rong, WU Liang-Ping. Angular distributions of photo-fragment ions of CH₃OH molecules in the femtosecond laser fields[J]. Journal of East China Normal University(Natural Sc, 2015, 2015(1): 178-185.

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Angular distributions of photo-fragment ions of CH₃OH molecules in the femtosecond laser fields

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