Abstract
We investigate theoretically the photoionization of triatomic molecular ion by numerically solving the two-dimensional time-dependent Schrödinger equations under Bohn-Oppenheimer approximation. The results show that the photoelectron momentum distributions (PMDs) of 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.
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