title: Angular tunneling ionization probability of fixed-in-space H2 molecules in intense laser pulses.
abstract: We propose a new approach to obtain molecular frame photoelectron angular distributions from molecules ionized by intense laser pulses. With our method we study the angular tunnel ionization probability of H2 at a wavelength of 800 nm over an intensity range of 2-4.5 x 10(14) W/cm2. We find an anisotropy that is stronger than predicted by any existing model. To explain the observed anisotropy and its strong intensity dependence we develop an analytical model in the framework of the strong-field approximation. It expresses molecular ionization as a product of atomic ionization rate and a Fourier transform of the highest occupied molecular orbital filtered by the strong-field ionization process.
authors.affiliation: National Research Council, 100 Sussex Drive, Ottawa, Ontario, Canada K1A 0R6.
authors.forename: A
authors.initials: A
authors.lastname: Staudte
authors.forename: S
authors.initials: S
authors.lastname: Patchkovskii
authors.forename: D
authors.initials: D
authors.lastname: Pavicić
authors.forename: H
authors.initials: H
authors.lastname: Akagi
authors.forename: O
authors.initials: O
authors.lastname: Smirnova
authors.forename: D
authors.initials: D
authors.lastname: Zeidler
authors.forename: M
authors.initials: M
authors.lastname: Meckel
authors.forename: D M
authors.initials: DM
authors.lastname: Villeneuve
authors.forename: R
authors.initials: R
authors.lastname: Dörner
authors.forename: M Yu
authors.initials: MY
authors.lastname: Ivanov
authors.forename: P B
authors.initials: PB
authors.lastname: Corkum