Photo Double Ionization of Helium 100 eV and 450 eV above Threshold:  I.  Linearly Polarized Light

Knapp, A; Kheifets, Anatoli; Bray, Igor; Weber, Thorsten; Landers, A L; Schossler, S; Jahnke, T.; Nickles, J; Kammer, S; Jagutski, O.; Schmidt, L Ph H; Schoffler, M S; Osipov, T; Prior, M H; Schmidt-Böcking, H; Cocke, C L; Dorner, R

Photo Double Ionization of Helium 100 eV and 450 eV above Threshold: I. Linearly Polarized Light

Date

2005

Authors

Knapp, A

Kheifets, Anatoli

Bray, Igor

Weber, Thorsten

Landers, A L

Schossler, S

Jahnke, T.

Nickles, J

Kammer, S

Jagutski, O.

Publisher

Institute of Physics Publishing

Abstract

We present a joint experimental and theoretical study for the fully differential cross section of the photo double ionization (PDI) of helium with linearly polarized light at the excess energies Eexc = 100 eV and 450 eV above the threshold. The fully differential cross section is obtained by measuring the three-dimensional momentum vectors of one electron and the He2+ ion in coincidence using the COLTRIMS method. We give an overview of the momentum distribution of the three-body continuum 100 eV above the threshold. We show angular distributions for both electrons for various energy sharings at Eexc = 100 eV and 450 eV. The experimental results are well reproduced by a set of convergent close-coupling (CCC) calculations.