title: Exact nondipole Kramers-Henneberger form of the light-atom hamiltonian: an application to atomic stabilization and photoelectron energy spectra.
abstract: The exact nondipole minimal-coupling Hamiltonian for an atom interacting with an explicitly time- and space-dependent laser field is transformed into the rest frame of a classical free electron in the laser field, i.e., into the Kramers-Henneberger frame. The new form of the Hamiltonian is used to study nondipole effects in the high-intensity, high-frequency regime. Fully three-dimensional nondipole ab initio wave packet calculations show that the ionization probability may decrease for increasing field strength. We identify a unique signature for the onset of this dynamical stabilization effect in the photoelectron spectrum.
authors.affiliation: Department of Physics and Technology, University of Bergen, Norway.
authors.forename: M
authors.initials: M
authors.lastname: Førre
authors.forename: S
authors.initials: S
authors.lastname: Selstø
authors.forename: J P
authors.initials: JP
authors.lastname: Hansen
authors.forename: L B
authors.initials: LB
authors.lastname: Madsen