Photoelectron angular distributions and correlations in sequential double and triple atomic ionization by free electron lasers

Abstract

We present a review of theoretical studies of the simplest nonlinear photoprocesses detected in the XUV range with the use of free electron lasers: sequential double and triple ionization of atoms by two and three XUV photons. Photoelectron angular distributions and angular correlations between emitted electrons are considered. A comparison of the calculated results with recent angle-resolved photoelectron spectroscopy experiments is discussed.

Signatures of autoionization in the angular electron distribution in two-photon double ionization of Ar

“…These predictions by theory were tested by several experimental studies [10][11][12][13][14] (for a review see [15]). The angular distribution of the second electron ejected in SDI from the np 6 shells of Ne, Ar, Kr, Xe was measured for various photon energies by Braune et al [10].…”

Circular Dichroism in Multiphoton Ionization of Resonantly ExcitedHe+Ions

“…The theoretical description of the present experiment is based on the two-step model of He sequential double ion- ization [35,36], where the initial step of creating He + (1s) is decoupled from the subsequent excitation-ionization of the He + (3p) state. Then the non-relativistic time-dependent Schrödinger equation (TDSE) is solved numerically for the He + electron in the field of both the circularly polarized XUV and NIR pulses.…”

Symmetry breakdown of electron emission in extreme ultraviolet photoionization of argon

“…( 1 )] can principally contribute even to the PAD of the first ionization step in a two-photon process as discussed in more detail in refs. 62 – 64 . However, the contribution is theoretically found and experimentally confirmed to be negligible after summation over the 3 p 4 3 P, 1 D, and 1 S final states of the doubly charged ion.…”