Phys. Rev. A 79, 023409 (2009) [7 pages]Angular anisotropy parameters for sequential two-photon double ionization of heliumReceived 5 November 2008; published 5 February 2009 We evaluate photoelectron angular anisotropy β parameters for the process of sequential two-photon double electron ionization of helium within the lowest-order time-independent perturbation theory. Our results indicate that for photoelectron energies outside the interval (Eslow,Efast), where Eslow=ω−VHe+ and Efast=ω−VHe, there is a considerable deviation from the dipole angular distribution, thus indicating the effect of electron correlation. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.79.023409
DOI:
10.1103/PhysRevA.79.023409
PACS:
32.80.Rm, 32.80.Fb, 42.50.Hz
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