Angular anisotropy parameters and recoil-ion momentum distribution in two-photon double ionization of helium

Journal Article · Wed Aug 15 00:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.76.025402· OSTI ID:21016071

Kheifets, A S; Ivanov, I A ^[1]; Bray, Igor ^[2]

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1. Research School of Physical Sciences and Engineering, Australian National University, Canberra ACT 0200 (Australia)
2. ARC Centre for Matter-Antimatter Studies, Curtin University, GPO Box U1987, Perth, WA 6845 (Australia)

We present convergent-close-coupling (CCC) calculations of the angular anisotropy parameters {beta}{sub 2},{beta}{sub 4} and the recoil ion momentum distribution d{sigma}/dp in two-photon double ionization (TPDI) of helium. In a stark contrast to single-photon double ionization (SPDI), where the {beta}{sub 2} parameter varies widely changing the angular distribution from isotropic to nearly dipole for slow and fast photoelectrons, respectively, the {beta} 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.

• OSTI ID: 21016071
• Journal Information: Physical Review. A, Vol. 76, Issue 2; Other Information: DOI: 10.1103/PhysRevA.76.025402; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
ANISOTROPY
APPROXIMATIONS
ATOMS
COUPLING
DIPOLES
HELIUM
IONIZATION
IONS
MULTI-PHOTON PROCESSES
PHOTOIONIZATION
PHOTON-ATOM COLLISIONS
PHOTONS
POLARIZATION
RECOILS