title: Structure effects in angle-resolved high-order above-threshold ionization of molecules.
abstract: We present energy-resolved angular distributions of photoelectrons generated in above-threshold ionization (ATI) of nonaligned diatomic molecules N2 and O2 in high-intensity short laser pulses, with emphasis on the most energetic part of the spectra. The angular distribution for photoelectrons with energy of 10U(p) (U(p): ponderomotive energy), i.e., the plateau cutoff in ATI spectra, is found to be broader in O2 than in N2. Resorting to the analyses from both an S-matrix theory and an intuitive semiclassical model, we attribute the observation to the effect of the ground state molecular orbital structure on high-energy electron emission in strong-field molecular ionization.
authors.affiliation: State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China.
authors.forename: H
authors.initials: H
authors.lastname: Kang
authors.forename: W
authors.initials: W
authors.lastname: Quan
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.forename: Z
authors.initials: Z
authors.lastname: Lin
authors.forename: M
authors.initials: M
authors.lastname: Wu
authors.forename: H
authors.initials: H
authors.lastname: Liu
authors.forename: X
authors.initials: X
authors.lastname: Liu
authors.forename: B B
authors.initials: BB
authors.lastname: Wang
authors.forename: H J
authors.initials: HJ
authors.lastname: Liu
authors.forename: Y Q
authors.initials: YQ
authors.lastname: Gu
authors.forename: X Y
authors.initials: XY
authors.lastname: Jia
authors.forename: J
authors.initials: J
authors.lastname: Liu
authors.forename: J
authors.initials: J
authors.lastname: Chen
authors.forename: Y
authors.initials: Y
authors.lastname: Cheng