Angular correlations in the two--photon decay of helium--like heavy ions

Abstract

The two-photon decay of heavy, helium-like ions is investigated based on second-order perturbation theory and Dirac's relativistic equation. Special attention has been paid to the angular emission of the two photons, i.e., how the angular correlation function depends on the shell structure of the ions in their initial and final states. Moreover, the effects from the (electric and magnetic) non-dipole terms in the expansion of the electron-photon interaction are discussed. Detailed calculations have been carried out for the two-photon decay of the $1s2s{}^1{S}_0$, $1s2s{}^3{S}_1$ and $1s2p{}^3{P}_0$ states of helium-like xenon Xe${}^{52+}$, gold Au${}^{77+}$ and uranium U${}^{90+}$ ions.

References in corpus (3)

• Algebraic tools for dealing with the atomic shell model. I. Wavefunctions and integrals for hydrogen--like ions
• Relativistic calculation of the two-photon decay rate of highly-excited ionic states
• Interelectronic-interaction effect on the transition probability in high-Z He-like ions

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• Quantum correlations in the two-photon decay of few-electron ions
• Interelectronic-interaction effects on the two-photon decay rates of heavy He-like ions
• Relativistic calculations of the non-resonant two-photon ionization of neutral atoms
• Angular and polarization analysis for two-photon decay of 2s hyperfine states of hydrogenlike Uranium
• Photon-photon polarization correlations as a tool for studying parity non-conservation in heliumlike Uranium
• Spin effects probed by Rayleigh X-ray scattering off hydrogenic ions
• Analytical evaluation of atomic form factors: application to Rayleigh scattering
• Relativistic effects in the non-resonant two-photon K-shell ionization of neutral atoms
• Two-photon processes based on quantum commutators