Semiclassical description of multiphoton processes

Details Semiclassical description of multiphoton processes Semiclassical description of multiphoton processes

2000-02-20

arxiv.org/abs/physics/0002038v1

Phys Rev A 62, 053403 (2000)

Physics

Atomic Physics

10 pages, 11 figures

Scientific paper

10.1103/PhysRevA.62.053403

We analyze strong field atomic dynamics semiclassically, based on a full time-dependent description with the Hermann-Kluk propagator. From the properties of the exact classical trajectories, in particular the accumulation of action in time, the prominent features of above threshold ionization (ATI) and higher harmonic generation (HHG) are proven to be interference phenomena. They are reproduced quantitatively in the semiclassical approximation. Moreover, the behavior of the action of the classical trajectories supports the so called strong field approximation which has been devised and postulated for strong field dynamics.

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