Nuclear kinetic energy spectra of D_2^+ in intense laser field: Beyond Born Oppenheimer approximation

TL;DR

This paper investigates the nuclear kinetic energy spectra of D_2^+ in intense laser fields, incorporating beyond Born-Oppenheimer effects to reveal detailed dissociation and ionization dynamics through full-dimensional simulations.

Contribution

It introduces a method to calculate R-dependent ionization rates and substructure spectra beyond the Born-Oppenheimer approximation, advancing understanding of molecular dissociation under intense lasers.

Findings

Revealed substructures in nuclear kinetic energy spectra.

Compared simulation results with recent experimental data.

Demonstrated significance of beyond Born-Oppenheimer effects.

Abstract

Simultaneously, the vibrational nuclear dynamics and full dimensional electronic dynamics of the deuterium molecular ion exposed to the linear polarized intense laser field are studied. The time dependent Schr\"odinger equation of the aligned D2+ with the electric laser field is solved for the simulation of the complicated dissociative ionization processes and compared with the recent related experimental results. In this work, the R-dependent ionization rate and the enhanced ionization phenomenon beyond the Born-Oppenheimer approximation (BOA) are introduced and calculated. The substructure of the nuclear kinetic energy release spectra are revealed as the Coulomb explosion energy spectra and dissociation energy spectra in the dissociation-ionization channel. The significant and trace of these distinct sub-spectra in the total spectra comparatively are displayed and discussed.