Photoelectron angular distribution in two-pathway ionization of neon with femtosecond XUV pulses

TL;DR

This paper investigates the angular distribution of photoelectrons in neon caused by interference between one-photon and two-photon ionization pathways using femtosecond XUV pulses, combining numerical and perturbative methods.

Contribution

It introduces a combined approach using time-dependent Schrödinger equation and perturbation theory to analyze two-pathway ionization in neon with femtosecond XUV pulses.

Findings

Good agreement between numerical and perturbative results within applicable domain.

Identification of anisotropy parameters for photoelectron angular distribution.

Analysis of the effect of pulse parameters on ionization pathways.

Abstract

We analyze the photoelectron angular distribution in two-pathway interference between non\-resonant one-photon and resonant two-photon ionization of neon. We consider a bichromatic femtosecond XUV pulse whose fundamental frequency is tuned near the $2p^5 3s$ atomic states of neon. The time-dependent Schr\"odinger equation is solved and the results are employed to compute the angular distribution and the associated anisotropy parameters at the main photoelectron line. We also employ a time-dependent perturbative approach, which allows obtaining information on the process for a large range of pulse parameters, including the steady-state case of continuous radiation, i.e., an infinitely long pulse. The results from the two methods are in relatively good agreement over the domain of applicability of perturbation theory.