Strong Laser Fields
Welcome to the Strong Laser Fields Group at the Department of Molecular and Optical Physics, University of Freiburg, Germany.
Channel-Switching in Above-Threshold Ionization of Xenon
V. Schyja, T. Lang and H. Helm
Department of Molecular and Optical Physics, Albert-Ludwigs-Universität, Hermann-Herder-Strasse 3, D-79104 Freiburg, Germany
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 ~ 3 x 1013 W/cm2 and the
dominant ionization path to switch from (8+1)-photon resonant ionization via f-type Rydberg states to (9+1)-photon resonant
ionization via g-type Rydberg states. Very low-energy electrons are observed prior to reaching the channel closing intensity,
indicative of a contribution of nonresonant ionization.
©1998 The American Physical Society
©1998 Physical Review A 57, 3692 (1998)
PACS: 32.80.Rm, 33.80.Rv, 42.50.Hz