Angular distributions of photo-fragment ions of CH<sub>3</sub>OH molecules in the femtosecond laser fields

FAN Qing-Fei; YANG Yan; WU Hua; ZHOU Bin; WANG Xiao; TENG Chong; SUN Zhen-Rong; WU Liang-Ping

doi:10.3969/j.issn.1000-5641.2015.01.022

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Mar. 2015

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Article Navigation > Journal of East China Normal University (Natural Sciences) > 2015 > (1): 178-185

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 Sciences), 2015, (1): 178-185. doi: 10.3969/j.issn.1000-5641.2015.01.022

Citation:

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 Sciences), 2015, (1): 178-185. doi: 10.3969/j.issn.1000-5641.2015.01.022

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

doi: 10.3969/j.issn.1000-5641.2015.01.022

1.
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China

Received Date: 2014-03-01
Publish Date: 2015-01-25

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 a2 and cos2 values for each channel were calculated, which indicated the dynamic molecular alignments of methanol in the femtosecond laser fields dominates.
- femtosecond laser,
- angular distribution,
- molecule alignment

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References

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