title: Nondipole ionization dynamics of atoms in superintense high-frequency attosecond pulses.
abstract: The ionization of H(1s) in superintense, high-frequency, attosecond pulses is studied beyond the dipole approximation. We identify a unique nondipole 3rd lobe in the angular distribution of the ejected electron and show that this lobe has a well-defined classical counterpart. The ionization is likely to occur in the direction opposite to the laser propagation direction, which is fully understood from an analysis of the classical dynamics.
authors.affiliation: Department of Physics and Technology, University of Bergen, N-5007 Bergen, Norway.
authors.forename: M
authors.initials: M
authors.lastname: Førre
authors.forename: J P
authors.initials: JP
authors.lastname: Hansen
authors.forename: L
authors.initials: L
authors.lastname: Kocbach
authors.forename: S
authors.initials: S
authors.lastname: Selstø
authors.forename: L B
authors.initials: LB
authors.lastname: Madsen