Control of resonant ionization as a function of time delay between two XUV few-femtosecond pulses. Quantitative application to helium

TL;DR

This paper demonstrates how ultrashort time delays between two XUV femtosecond pulses can control two-photon resonant ionization in helium, using nonperturbative solutions of the time-dependent Schrödinger equation and comparing with perturbation theory.

Contribution

It introduces a method to control resonant ionization with femtosecond pulse timing, validated through nonperturbative calculations and comparison with perturbative approaches.

Findings

Feasibility of controlling helium ionization with femtosecond pulse delay

Nonperturbative solutions provide detailed insight into the process

Comparison with perturbation theory enhances understanding of the dynamics

Abstract

It is shown that it is feasible to use ultrashort time delay between two XUV femtosecond pulses in order to control two photon resonant ionization. The proposal is demonstrated on the spectrum of Helium, in terms of nonperturbative solutions of the time dependent Schroedinger equation. Comparison with results from second order time dependent perturbation theory provides additional insight.