Angle-dependent electron-electron correlation in the single ionization of H2 in strong laser fields

The one-photon ionization and tunneling ionization of H-2 exposed to strong XUV and infrared laser pulses are studied by numerically simulating the four-dimensional time-dependent Schrodinger equation, which includes two-electron dynamics for arbitrary angle between the molecular axis and the laser polarization direction. In the one-photon single ionization of H-2, one electron escapes fast and the other bound electron is not disturbed but remains in coherent superposition of two electronic states of H-2(+). In another case, under the irradiation of strong infrared laser pulses, one electron tunnels through the laser-dressed Coulomb barrier, and the other bound electron has enough time to adapt to the potential of H-2(+) and thus is prone to transfer to the ground electronic state of H-2(+). In the intermediate regime, between the one photon and tunneling regimes, this electron-electron correlation depends strongly on the laser frequency, laser intensity and on the angle between laser polarization and the molecular axis.