Abstract
The intensity dependence of the angular and energy distributions of photoelectrons is used to map the effect of channel closing in short-pulse, multiphoton ionization of xenon. At 800 nm, we observe the nine-photon channel to close at and the dominant ionization path to switch from -photon resonant ionization via -type Rydberg states to -photon resonant ionization via -type Rydberg states. Very low-energy electrons are observed prior to reaching the channel closing intensity, indicative of a contribution of nonresonant ionization.
- Received 18 August 1997
DOI:https://doi.org/10.1103/PhysRevA.57.3692
©1998 American Physical Society