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Manipulating the photodetachment dynamics of the H2− ion by a Gaussian laser field

The photodetachment of the H2− ion in a time-dependent electric field is investigated for the first time. On the basis of time-dependent closed orbit theory, we calculate the photodetachment cross section (PCS) of a H2− ion manipulated by a Gaussian laser field. We use the superposition principle and consider the interaction between two atomic centers in the H2− ion to construct the electron wave function after photodetachment from the H2− ion. Three different types of closed orbits for the photodetached electron in the Gaussian laser field are found. The PCS of the H2− ion can be controlled by varying the Gaussian laser field strength, pulse duration, and final time where the electron moves in the laser field through numerical calculation. The oscillating cross section of the H2− ion is approximately twice that of the H− ion by comparing their PCS in the same Gaussian laser field, thereby suggesting that the interference effect of the two centers in the H2− ion is extremely significant. This study provides a semiclassical method for exploring the photodetachment dynamics of the negative molecular ion in the Gaussian laser field. Furthermore, it serves as guide for future molecular photodetachment microscopy experiments in the time-dependent electric field.