中国物理B ›› 2009, Vol. 18 ›› Issue (11): 4807-4814.doi: 10.1088/1674-1056/18/11/033
谭放, 彭良友, 龚旗煌
Tan Fang(谭放), Peng Liang-You(彭良友)†, and Gong Qi-Huang(龚旗煌)‡
摘要: We investigate the ionization dynamics of atoms by chirped attosecond pulses using the strong field approximation method. The pulse parameters are carefully chosen in the regime where the strong field approximation method is valid. We analyse the effects of the chirp of attosecond pulses on the energy distributions and the corresponding left-right asymmetry of the ionized electrons. For a single chirped attosecond pulse, the ionized electrons can be redistributed and the left-right asymmetry shows oscillations because of the introduction of the chirp. For time-delayed double attosecond pulses at different intensities with the weaker one chirped, exchanging the order of the two pulses shows a relative shift of the energy spectra, which can be explained by the different effective time delays of different frequency components because of the chirp.
中图分类号: (Photoionization of atoms and ions)