Ionization of atoms by chirped attosecond pulses |
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| Authors: | Tan Fang Peng Liang-You and Gong Qi-Huang |
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| Affiliation: | State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China |
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| 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. |
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| Keywords: | photoionization rate attosecond pulse asymmetry chirp |
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