Photodetachment dynamics from closed-shell anions in the presence of a bichromatic field

摘要

I have studied the dynamics of photodetachment from closed-shell anions in the presence of a two-color (bichromatic) laser field. The electronic states of halide ions are modeled by a 1-D Hamiltonian with a potential V(x) -V(0)e(-sigma x2). The two parameters V-0 and sigma- are fixed by requiring V(x) to reproduce the experimentally observed ground-state ionization energy of the halide ions concerned. The potentials so generated are shown to support only one bound state in each case. The time-dependent Fourier grid Hamiltonian method is used to follow the detachment dynamics with fairly high intensities of light. The environmental effects on the dynamics are sought to be modeled by allowing the well depth (V-0) to fluctuate randomly (V-0(t) = V-0[1 + Delta VR(t)]; R(t) randomly fluctuates between +1 and -1 with time, when Delta V is fixed). The average detachment rate constants k(av), are seen to increase with increase in the intensities of used bichromatic field. An alternative model potential, V(x) = -V(0)e(-sigma x), is also shown to yield similar results. (c) 2005 Wiley Periodicals, Inc.