Abstract
We present photoelectron angular distribution of the aligned molecular ion H2+ by intense ultrashort attosecond extreme ultraviolet laser pulses from numerical solutions of time-dependent Schrödinger equations. Photoionization from a superposition state of the ground 1sσg and the excited 2pσu states with pulses at photon energies above the ionization potential, ħω>Ip, and intensity 1014 W/cm2, yields pulse duration dependent asymmetry of photoelectron angular distributions. We attribute the asymmetry to the periodical oscillation of the coherent electron wave packets, resulting from the interference of the two electronic states. For the processes with long pulse durations, such duration dependence is absent and symmetric angular distributions are obtained.
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