Dynamic alignment of O-2 investigated by using two linearly polarized femtosecond laser pulses

作者：Wu CY^*; Huang J; Xu N; Ma R; Yang H; Jiang HB; Gong QH

来源：Journal of Physics B: Atomic, Molecular and Optical Physics , 2006, 39(5): 1035-1043.

DOI：10.1088/0953-4075/39/5/003

We studied the multielectron ionization and Coulomb explosion of O-2 irradiated by 110 fs, 810 nm laser pulses at an intensity of 10(15) W cm(-2). Strong anisotropic angular distributions with the same widths were observed for the atomic ions On+ (n = 1-3). Using two linearly polarized laser pulses with crossed polarization, we found that the atomic ions generated in the second laser pulse were strongly depleted by the first laser pulse for various delay times. The results demonstrate that dynamic alignment dominates for O-2 under the experimental conditions. Moreover, the same angular distributions for all the atomic ions On+ (n = 1-3) further demonstrate that dynamic alignment mainly occurs at the rising edge of the laser pulse with laser intensity below the ionization threshold and the neutral O-2 aligns along the laser polarization vector prior to ionization.

• 出版日期2006-3-14
• 单位北京大学