Interferences driven by the few-cycle laser field in the photodetachment of Cl− ion

Abstract

The time-dependent semiclassical theory is extended to study the photodetachment of negative ions with outer p-state electrons. The photodetachment cross section of Cl− ion is specially studied exposed to a few-cycle laser field. Considering the influence of laser field effects, the photodetachment cross section is found to oscillate complicatedly with increasing laser intensity and frequency. We demonstrate that different types of closed orbit have different impacts on the interference structures in the photodetachment cross section. Detailed analysis of the t-ti map of the detached electron reveals a remarkably correlation with the initial phase in the laser field. Additionally, the profiles of photodetachment cross section show strong dependence on the optical cycle number N in the laser field, indicating that it is an important parameter for controlling the photodetachment of negative ion. The method adopted in this work is universal, and can be applied to study the photodetachment of other halide negative ions in the laser field, such as F− ion, Br− ion, etc This work provides a new method for the experimentalists to coherent control of the photodetachment process of negative ion using a few-cycle laser field.