Above-threshold detachment of negative ions by circularly polarized few-cycle laser fields
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摘要:
In accordance with nonperturbative quantum scattering theory, we investigate photoelectron angular distributions (PADs) from above-threshold detachment (ATD) of negative ions irradiated by circularly polarized few-cycle laser fields. Electrons ejected on the polarization plane demonstrate distinct anisotropies in angular distributions which distinctly vary with the carrier-envelope (CE) phase. The anisotropy is caused by interference between transition channels; it also depends strongly on laser frequency, pulse duration,and kinetic energy of photoelectrons. Optimal emission of photoelectrons, which varies with CE phase,makes it possible to control photoelectron motion.