Dynamic alignment of C2H4 investigated by using two linearly polarized femtosecond laser pulses

作者：Xu Nan; Wu Chengyin^*; Ma Ri; Huang Juan; Wu Zhifeng; Liang Qingqing; Yang Hong; Gong Qihuang

来源：Journal of the American Society for Mass Spectrometry, 2006, 17(12): 1717-1724.

DOI：10.1016/j.jasms.2006.08.002

We have studied multielectron ionization and Coulomb explosion of C2H4 irradiated by 110 fs, 800 nm laser pulses at an intensity of similar to 10(15) W/cm(2). Strong anisotropic angular distributions were observed for the atomic ions Cn+(n = 1-3). Based on the results of two crossed linearly polarized laser pulses, we conclude that such anisotropic angular distributions result from dynamic alignment, in which the rising edge of the laser pulses aligns the neutral C,H, molecules along the laser polarization direction. The angular distribution of the exploding fragments, therefore, reflects the degree of the alignment of molecules before ionization. Using the same femtosecond laser with intensity below the ionization threshold, the alignment of C,H, molecules was also observed.

• 出版日期2006-12
• 单位北京大学