Probing the dynamic interference in molecular high-order harmonic generation through Bohmian trajectories

TL;DR

This paper uses Bohmian trajectories to analyze dynamic interference in molecular high-order harmonic generation, revealing that two localized trajectories at the ions can replicate the main spectral features and encode molecular structure information.

Contribution

It demonstrates that two Bohmian trajectories at the ions are sufficient to reproduce key spectral features and interference effects in molecular HHG, providing insight into the underlying dynamics.

Findings

Two localized trajectories can reproduce the main harmonic spectrum features.

Interference between these trajectories causes spectral dips indicating molecular structure.

Trajectory amplitudes and frequencies reflect harmonic intensity and distribution.

Abstract

By using Bohmian trajectory method, we investigate the dynamic interference in diatomic molecular high-order harmonic generation progress. It is demonstrated that the main characteristics of the molecular harmonic spectrum can be well reproduced by only two Bohmain trajectories which are located respectively at the two ions. This is because these two localized trajectories can receive and store the whole collision information coming from all of the other recollision trajectories. Therefore, the amplitudes and frequencies of these two trajectories represent the intensity and frequency distribution of the harmonic generation. Moreover, the interference between these two trajectories shows a dip in the harmonic spectrum, which indicates the molecular structure information. ?