Photo double ionization of helium 100 eV and 450 eV above threshold: I

doi:10.1088/0953-4075/38/6/001

Photo double ionization of helium 100 eV and 450 eV above threshold: I. Linearly polarized light

A Knapp et al 2005 J. Phys. B: At. Mol. Opt. Phys. 38 615-633 doi: 10.1088/0953-4075/38/6/001

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A Knapp¹, A Kheifets², I Bray³, Th Weber^1,5,6, A L Landers⁴, S Schössler¹, T Jahnke¹, J Nickles¹, S Kammer¹, O Jagutzki¹, L Ph H Schmidt¹, M Schöffler¹, T Osipov^5,6, M H Prior⁶, H Schmidt-Böcking¹, C L Cocke⁵ and R Dörner¹
¹ Institut für Kernphysik, Universität Frankfurt, August-Euler-Str. 6, D-60486 Frankfurt, Germany
² Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia
³ Centre for Atomic, Molecular and Surface Physics, Murdoch University, Perth, 6150, Australia
⁴ Physics Department, Auburn University, Auburn, AL 36849, USA
⁵ Department of Physics, Kansas State University, Cardwell Hall, Manhattan, KS 66506, USA
⁶ Lawrence Berkeley National Lab, Berkeley, CA 94720, USA
E-mail: doerner@atom.uni-frankfurt.de

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 E_exc = 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 E_exc = 100 eV and 450 eV. The experimental results are well reproduced by a set of convergent close-coupling (CCC) calculations.

Print publication: Issue 6 (28 March 2005)
Received 30 November 2004, in final form 25 January 2005
Published 7 March 2005

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Photo double ionization of helium 100 eV and 450 eV above threshold: I. Linearly polarized light

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