The momentum distributions of triatomic molecular ion H32+ by intense laser pulses

Abstract

Abstract We investigate theoretically the photoionization of triatomic molecular ion H 3 2 + by numerically solving the two-dimensional time-dependent Schrödinger equations under Bohn-Oppenheimer approximation. The results show that the photoelectron momentum distributions (PMDs) of H 3 2 + with different initial states are strongly dependent on the laser ellipticities and molecular orbital symmetry, and the PMDs of degenerate electronic states E ± are mirror images. Also, for degenerate electronic states E ±, vortex structures appear in the PMDs by the counter-rotating circularly polarized laser pulses as the time delay between the two pulses increases, which can be explained by multi-center ionization and ultrafast photoionization model.