Photoelectron spectra in strong-field ionization by a high frequency field

Physics – Atomic Physics

Scientific paper

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Completely rewritten paper. Ionization by a two-color field is added

Scientific paper

10.1103/PhysRevA.79.063404

We analyze atomic photoelectron momentum distributions induced by bichromatic and monochromatic laser fields within the strong field approximation (SFA), separable Coulomb-Volkov approximation (SCVA), and ab initio treatment. We focus on the high frequency regime -- the smallest frequency used is larger than the ionization potential of the atom. We observe a remarkable agreement between the ab initio and velocity gauge SFA results while the velocity gauge SCVA fails to agree. Reasons of such a failure are discussed.

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