Angular and polarization correlations in two--photon decay of hyperfine 2s states in hydrogenlike ions

2012/03/29 by F. Fratini, Fratini, Filippo
Physics and Astronomy · #Atomic Physics (physics.atom-ph) #Atomic and Molecular Physics #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #Laser-Matter Interactions and Applications

paper · pdf · doi:10.48550/arxiv.1203.6601

openalex publication_date 2012/03/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The angular and polarization properties of the photon pair emitted in the two--photon decay of 2s hyperfine states in hydrogenlike ions are investigated within the relativistic Dirac framework and second order perturbation theory. The studied transitions are 2s_1/2 (F=1,0)→1s_1/2 (F=1,0) in Hydrogen atom and 2s_1/2 (F=4,3)→1s_1/2 (F=4,3) in hydrogenlike Uranium ion. Two different emission patterns are found: For non-spin-flip transitions, the angular correlation (i.e. the angular distribution of the emitted photons) is of the type ∼ 1+cos²θ, while the linear polarizations of the emitted photons are approximately parallel one another; For spin-flip transitions, the angular correlation is of the type ∼ 1-1/3cos²θ, while the linear polarizations of the emitted photons are approximately orthogonal one another.

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