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

C Dawson1, S Cvejanovic1,4, D P Seccombe1, T J Reddish1, F Maulbetsch1, A Huetz2, J Mazeau2 and A S Kheifets3

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LETTER TO THE EDITOR

(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.


PACS

32.80.Fb Photoionization of atoms and ions

31.15.-p Calculations and mathematical techniques in atomic and molecular physics

Subjects

Atomic and molecular physics

Computational physics

Dates

Issue 16 (28 August 2001)

Received 30 May 2001, in final form 10 July 2001

Published 1 August 2001



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