Two-photon ionization of Helium studied with the multiconfigurational time-dependent Hartree-Fock method

TL;DR

This paper applies the MCTDHF method to simulate two-photon ionization of Helium, demonstrating its accuracy in reproducing single- and double-ionization results compared to full configuration interaction calculations.

Contribution

It introduces the application of MCTDHF to model two-photon ionization in Helium and compares its results with exact TDCI solutions, showing good agreement.

Findings

MCTDHF accurately reproduces single-ionization results.

MCTDHF captures main trends of double ionization.

Results validate MCTDHF as a reliable method for this process.

Abstract

The multiconfigurational time-dependent Hartree-Fock method (MCTDHF) is applied for simulations of the two-photon ionization of Helium. We present results for the single- and double ionization from the groundstate for photon energies in the non-sequential regime, and compare them to direct solutions of the Schr\"odinger equation using the time-dependent (full) Configuration Interaction method (TDCI). We find that the single-ionization is accurately reproduced by MCTDHF, whereas the double ionization results correctly capture the main trends of TDCI.