Evidence of ac-Stark-shifted resonances in intense two-color circularly polarized laser fields

Abstract

We report on the appearance of a structure at low energies in the photo-electron momentum distribution of the hydrogen atom exposed to two-color counter-rotating bi-circular laser fields. These structures, which arise due to AC-Stark shifted resonances, break the three-fold symmetry, typical for the $\omega -2\omega$ bi-circular fields. We discuss the physical origin of this structure in terms of partial-wave interference between direct ionization channels and a resonant pathway, that passes through the AC-Stark shifted state and show how the underlying Rydberg state population depend on the field strength and pulse duration.

arXiv comment7 pages

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Cited by in corpus (6)

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• Controlling quantum numbers and light emission of Rydberg states via the laser pulse duration
• Sub-barrier pathways to Freeman resonances