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Energy-resolved photoelectron angular distributions of H+2 in intense femtosecond laser pulses

We present the first fully ab initio calculation of energy-resolved photoelectron angular distributions of H+2 for the 2Σ+g(1sσg) ground and the 2Σ+u(2pσu) excited state by the interaction with an arbitrary orientated linearly polarized intense 800 nm femtosecond laser pulse. We show that the electron angular distribution presents a forward–backward asymmetry along the direction of the polarization vector that depends strongly on the final electron energy. This loss of inversion symmetry results from the population of degenerate continuum states with opposite parities (gerade–ungerade). Additionally, our analysis confirms that the electron is prevented from escaping in the direction of the radiation field when the molecule has a nodal plane in this direction, a fact also reflected in our photoelectron-calculated momentum distributions.