Phys. Rev. A 76, 025402 (2007) [4 pages]Angular anisotropy parameters and recoil-ion momentum distribution in two-photon double ionization of heliumReceived 18 May 2007; published 28 August 2007 We present convergent-close-coupling (CCC) calculations of the angular anisotropy parameters β2,β4 and the recoil ion momentum distribution dσ∕dp in two-photon double ionization (TPDI) of helium. In a stark contrast to single-photon double ionization (SPDI), where the β2 parameter varies widely changing the angular distribution from isotropic to nearly dipole for slow and fast photoelectrons, respectively, the β parameters for TPDI show very little change. The angular distribution of the recoil ion is fairly isotropic in TPDI as opposed to a strong alignment with the polarization of light in SPDI. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.76.025402
DOI:
10.1103/PhysRevA.76.025402
PACS:
42.50.Hz, 32.80.Fb
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