Angular correlations in the two-photon decay of hydrogenlike ions: Relativistic Green's-function approach

Journal Article · Tue Feb 01 00:00:00 EST 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.71.022509· OSTI ID:20650076

Surzhykov, Andrey; Koval, Peter; Fritzsche, Stephan ^[1]

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1. Institut fuer Physik, Universitaet Kassel, D-34132 Kassel (Germany)

The angular correlations in the two-photon decay of hydrogenlike ions are studied within the framework of second-order perturbation theory, based on Dirac's equation. Particular attention has been paid to the effects which arise from the higher (nondipole) terms in the expansion of the electron-photon interaction. It is shown that the photon-photon angular correlation function, which is found symmetric with respect to the angle {theta}=90 deg. in the electric dipole approximation, becomes asymmetric because of the nondipole contributions, and that this effect is enhanced as the nuclear charge Z increases. Detailed computations on the photon-photon angular distribution have been carried out for the 2s{sub 1/2}{yields}1s{sub 1/2} and 3d{sub 5/2}{yields}1s{sub 1/2} transitions in neutral hydrogen (H) as well as for hydrogenlike xenon (Xe{sup 53+}) and uranium (U{sup 91+}) ions, and are compared with previous nonrelativistic results by Au [Phys. Rev. A 14, 531 (1976)])

• OSTI ID: 20650076
• Journal Information: Physical Review. A, Vol. 71, Issue 2; Other Information: DOI: 10.1103/PhysRevA.71.022509; (c) 2005 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 CORRELATION
ANGULAR DISTRIBUTION
ASYMMETRY
ATOMIC NUMBER
ATOMS
CATIONS
CORRECTIONS
DECAY
DIRAC EQUATION
ELECTRIC DIPOLES
GREEN FUNCTION
HYDROGEN
MULTI-PHOTON PROCESSES
PERTURBATION THEORY
PHOTON-ATOM COLLISIONS
PHOTON-ELECTRON INTERACTIONS
PHOTONS
RELATIVISTIC RANGE
URANIUM
URANIUM IONS
XENON
XENON IONS