Helium (γ, 2e) triple differential cross sections at an
excess energy of 60 eV

doi:10.1088/0953-4075/34/16/104

LETTER TO THE EDITOR

Helium (γ, 2e) triple differential cross sections at an excess energy of 60 eV

C Dawson et al 2001 J. Phys. B: At. Mol. Opt. Phys. 34 L525-L533 doi: 10.1088/0953-4075/34/16/104

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C Dawson¹, S Cvejanovic^1,4, D P Seccombe¹, T J Reddish¹, F Maulbetsch¹, A Huetz², J Mazeau² and A S Kheifets³
¹ Physics Department, Newcastle University, Newcastle-upon-Tyne NE1 7RU, UK
² Laboratoire de Spectroscopie Atomique et Ionique, Université Paris-Sud, Bat. 350, 91405, Orsay Cedex, France
³ Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia
⁴ Current address: Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195, Berlin, Germany.

Abstract. (γ, 2e) triple differential cross sections are presented for helium at 60 eV above the photodouble ionization threshold with energy-sharing ratios (R = E₂/E₁) for the two ejected electrons of R = 1, 5 and 11. The measurements were taken using a toroidal spectrometer and linearly polarized light from an undulator beamline (SU6) at the Super-ACO storage ring. Good agreement is found with TDCSs obtained by the CCC method and by the length gauge of 3C theory.

Print publication: Issue 16 (28 August 2001)
Received 30 May 2001, in final form 10 July 2001
Published 1 August 2001

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Helium (γ, 2e) triple differential cross sections at an excess energy of 60 eV

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