Eur. Phys. J. D (2017) 71: 105
https://doi.org/10.1140/epjd/e2017-70695-7

Regular Article

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

¹ Department of Physics and Astronomy, Drake University, Des Moines, 50311 Iowa, USA
² Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
³ Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia

^a e-mail: nicolas.douguet@drake.edu

Received: 7 November 2016
Received in final form: 18 January 2017
Published online: 18 May 2017

Abstract

We analyze the photoelectron angular distribution in two-pathway interference between nonresonant one-photon and resonant two-photon ionization of neon. We consider a bichromatic femtosecond XUV pulse whose fundamental frequency is tuned near the 2p⁵3s atomic states of neon. The time-dependent Schrödinger 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.