Phase Dependence of Intense Field Ionization: A Study Using Two Colors
Douglass SchumacherPhysics Department, Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109-1120F. WeihePhysics Department, Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109-1120H. G. MullerFOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The NetherlandsP. H. BucksbaumPhysics Department, Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109-1120
1994en
ABI
Аннотация
We present the first measurement of the ionization rate from above-threshold ionization (ATI) in an optical field whose phase dependence is known and controllable. Our method uses a harmonic two-color light field with a calibrated phase difference between the $1\ensuremath{\omega}$ and $2\ensuremath{\omega}$ fields. Our measurements confirm many of the predictions of recent semiclassical theories, but show an important discrepancy: An asymmetry in the ATI rates relative to the sign of the two-color phase difference supports recently suggested modifications to the models to include electron-core rescattering during ionization.
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