Eur. Phys. J. D 51, 401-407 (2009)
https://doi.org/10.1140/epjd/e2008-00260-6

Effects of the internuclear vector on the photoelectron angular distributions of H₂⁺

¹ State Key Lab. for High-Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, P.R. China
² Graduate School of Chinese Academy of Science, Beijing, 100049, China
³ Department of Physics, Southern University and AM college, Baton Rouge, Louisiana, 70813, USA

Corresponding author: ^a jtzhang@siom.ac.cn

Received: 30 June 2008
Revised: 9 October 2008
Published online: 16 January 2009

Abstract

We study the photoelectron angular distributions (PADs) of diatomic molecule H₂⁺ irradiated by intense laser fields using a nonperturbative scattering theory. We find that the internuclear vector may change the PADs. The PADs have qualitative changes with the increasing of the internuclear distance. The molecular orientation affect the symmetry of the PADs. When the internuclear vector is vertical or parallel to the laser polarization vector, the PADs are four-fold symmetric; for other case the PADs are two-fold symmetric. Due to the modulation effect resulting from the molecular multi-core nature, the size of the jet and the main lobe can be enlarged or reduced. The molecular modulation effect become obvious for large internuclear distance.