Abstract 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.
Received: 19 December 2008
Revised: 23 March 2009
Accepted manuscript online:
PACS:
32.80.Fb
(Photoionization of atoms and ions)
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 10704003 and
10821062) and the National Basic Research Program of China (Grant
No 2006CB806007).
Cite this article:
Tan Fang(谭放), Peng Liang-You(彭良友), and Gong Qi-Huang(龚旗煌) Ionization of atoms by chirped attosecond pulses 2009 Chin. Phys. B 18 4807
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