Relativistic evaluation of the two-photon decay of the metastable 1s22s2p 3P0 state in berylliumlike ions with an effective-potential model

被引：9

作者：

Amaro, Pedro ^{[1
]}

Fratini, Filippo ^{[2
]}

Safari, Laleh ^{[3
]}

Machado, Jorge ^{[1
,4
]}

Guerra, Mauro ^{[1
]}

Indelicato, Paul ^{[4
]}

Santos, Jose Paulo ^{[1
]}

机构：

[1] Univ Nova Lisboa, Fac Ciencias & Tecnol, Dept Fis, Lab Instrumentacao Engn Biomed & Fis Radiacao LIB, P-2829516 Caparica, Portugal

[2] Vienna Univ Technol, Atominst, A-1020 Vienna, Austria

[3] IST Austria, Campus 1, A-3400 Klosterneuburg, Austria

[4] Univ Paris 06, Sorbonne Univ, Ecole Normale Super, CNRS,Coll France,Lab Kastler Brossel, Case 74,4 Pl Jussieu, F-75005 Paris, France

来源：

PHYSICAL REVIEW A | 2016年 / 93卷 / 03期

基金：

奥地利科学基金会;

关键词：

MANY-BODY CALCULATIONS; HELIUM-LIKE; TRANSITION RATES; INTERCOMBINATION TRANSITION; M1; TRANSITION; LARGE-SCALE; LAMB SHIFT; HYDROGENLIKE; ENERGIES; LEVEL;

D O I：

10.1103/PhysRevA.93.032502

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The two -photon 1s(2)2s2p(3)P -> 1s(2)s(1)(2)S(0) transition in berylliumlike ions is investigated theoretically within a fully relativistic framework and a second-order perturbation theory. We focus our analysis on how electron correlation, as well as the negative-energy spectrum, can affect the forbidden El M1 decay rate. For this purpose, we include the electronic correlation via an effective local potential and within a single-configuration-state model. Due to its experimental interest, evaluations of decay rates are performed for berylliumlike xenon and uranium. We find that the negative -energy contribution can be neglected at the present level of accuracy in the evaluation of the decay rate. On the other hand, if contributions of electronic correlation are not carefully taken into account, it may change the lifetime of the metastable state by up to 20%. By performing a fully relativistic jj-coupling calculation, we find a decrease of the decay rate by two orders of magnitude compared to nonrelativistic LS-coupling calculations, for the selected heavy ions.

引用

页数：8

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