# Interference Structures in the High-Order Above-Threshold Ionization Spectra of Polyatomic Molecules in a Bicircular Laser Field

## TL;DR

This paper studies how laser fields affect ionization in a specific molecule, revealing interference patterns caused by electron wave interactions.

## Contribution

The study introduces a new method using molecular symmetry to explain interference minima in high-order above-threshold ionization spectra.

## Key findings

- HATI spectra show interference minima due to destructive interference of rescattered wave packets.
- Molecular symmetry and laser parameters strongly influence the observed interference structures.
- Conditions for two-, three-, and four-center interference are identified in the spectra.

## Abstract

We analyze the high-order above-threshold ionization (HATI) process of a small polyatomic molecule with C3 symmetry, which is induced by a bicircular strong laser field. This field consists of two coplanar, counter-rotating, circularly polarized components with frequencies rω and sω where r and s are integers. In our study, we use an improved molecular strong-field approximation to obtain electron energy-angle-resolved and momentum spectra of the BF3 molecule. We analyze the contributions of individual atoms as well as the impact of molecular symmetries on these spectra. We find that these spectra are significantly affected by the characteristics of the molecule and the laser-field parameters. Furthermore, we observe pronounced interference minima in the HATI spectra. We demonstrate that these minima result from the destructive interference of rescattered wave packets from different atomic centers, and we determine the conditions under which they occur, including two-, three-, and four-center interference.