Angular and polarization analysis for two-photon decay of 2s hyperfine states of hydrogenlike uranium

被引：9

作者：

Safari, L. ^{[1
]}

Amaro, P. ^{[2
]}

Santos, J. P. ^{[2
]}

Fratini, F. ^{[1
,3
,4
]}

机构：

[1] Univ Oulu, Dept Phys, FIN-90014 Oulu, Finland

[2] Univ Nova Lisboa, Fundacao Ciencia & Tecnol, Fac Ciencias & Tecnol, Dept Fis,Ctr Fis Atom, P-2829516 Caparica, Portugal

[3] Univ Fed Minas Gerais, Dept Fis, BR-31270901 Belo Horizonte, MG, Brazil

[4] CNRS, Inst Neel, F-38042 Grenoble 9, France

来源：

PHYSICAL REVIEW A | 2014年 / 90卷 / 01期

基金：

芬兰科学院;

关键词：

HELIUM-LIKE IONS; TRANSITIONS; RATES; METASTABILITY; RADIATION; S-1(0); ATOMS; SHAPE;

D O I：

10.1103/PhysRevA.90.014502

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The amplitude of two-photon transitions between hyperfine states in hydrogenlike ions is derived based on the relativistic Dirac equation and second-order perturbation theory. We study angular and linear polarization properties of the photon pair emitted in the decay of 2s states, where spin-flip and non-spin-flip transitions are highlighted. We pay particular attention to hydrogenlike uranium, since it is an ideal candidate for investigating relativistic and high-multipole effects, such as spin-flip transitions. Two types of emission patterns are identified: (i) non-spin-flip transitions are found to be characterized by an angular distribution of the type W(theta) similar to 1 + cos(2) theta while the polarizations of the emitted photons are parallel; and (ii) spin-flip transitions have somewhat smaller decay rates and are found to be characterized by an angular distribution of the type W(theta) similar to 1 - 1/3 cos(2) theta while the polarizations of the emitted photons are orthogonal, where theta is the angle between photons directions. Deviations due to nondipole and relativistic contributions are evaluated for both types of transitions. This work is the first step toward exploring the effect of the nucleus over the angular and polarization properties of the photon pairs emitted by two-photon transitions.

引用

页数：5

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