Strong field dynamics with ultrashort electron wave packet replicas

Details Strong field dynamics with ultrashort electron wave packet replicas Strong field dynamics with ultrashort electron wave packet replicas

2009-02-25

arxiv.org/abs/0902.4325v1

New Journal of Physics 11, 053011 (2009)

Physics

Atomic Physics

14 pages, 8 figures

Scientific paper

We investigate theoretically electron dynamics under a VUV attosecond pulse train which has a controlled phase delay with respect to an additional strong infrared laser field. Using the strong field approximation and the fact that the attosecond pulse is short compared to the excited electron dynamics, we arrive at a minimal analytical model for the kinetic energy distribution of the electron as well as the photon absorption probability as a function of the phase delay between the fields. We analyze the dynamics in terms of electron wave packet replicas created by the attosecond pulses. The absorption probability shows strong modulations as a function of the phase delay for VUV photons of energy comparable to the binding energy of the electron, while for higher photon energies the absorption probability does not depend on the delay, in line with the experimental observations for helium and argon, respectively.

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