Journal of East China Normal University(Natural Sc ›› 2015, Vol. 2015 ›› Issue (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

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

  1. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
  • Received:2014-03-01 Online:2015-01-25 Published:2015-03-29

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 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

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