TY - JOUR
T1 - Parametrization of the angular correlation and degree of linear polarization in two-photon decays of hydrogenlike ions
AU - Amaro, P.
AU - Fratini, F.
AU - Fritzsche, S.
AU - Indelicato, P.
AU - Santos, J. P.
AU - Surzhykov, A.
N1 - This research was supported in part by FCT-Fundacao para a Ciencia e a Tecnologia (Portugal), through the Projects No. PEstOE/FIS/UI0303/2011 and No. PTDC/FIS/117606/2010, financed by the European Community Fund FEDER through the COMPETE D Competitiveness Factors Operational Programme, by the French-Portuguese collaboration (PESSOA Program, Contract No. 441.00), by the Accoes Integradas Luso-Francesas (Contract No. F-11/09), and by the Programme Hubert Curien and Accoes Integradas Luso-Alemas (Contracts No. 20022VB and No. A-19/09). This research was partly supported by the Helmholtz Alliance HA216/EMMI. Laboratoire Kastler Brossel is "Unite Mixte de Recherche no 8552" of Ecole Normale Superieure, CNRS and Universite Pierre et Marie Curie. P.A. acknowledges the support of the FCT, under Contract No. SFRH/BD/37404/2007, and German Research Foundation (DFG) within the Emmy Noether program under Contract No. TA 740 1-1. A.S. and F.F. acknowledge support from the Helmholtz Gemeinschaft and GSI under Project No. VH-NG-421 and from the Deutscher Akademischer Austauschdienst (DAAD) under Project No. 0813006. S.F. acknowledges the support by the FiDiPro program of the Finish Academy. F.F. acknowledges the support by the Research Council for Natural Sciences and Engineering of the Academy of Finland.
PY - 2012/10/16
Y1 - 2012/10/16
N2 - The spontaneous two-photon emission in hydrogenlike ions is investigated within the framework of second-order perturbation theory and Dirac's equation. Special attention is paid to the angular correlation of the emitted photons as well as to the degree of linear polarization of one of the two photons, if the second is just observed under arbitrary angles. Expressions for the angular correlation and the degree of linear polarization are expanded in powers of cosine functions of the two-photon opening angle, whose coefficients depend on the atomic number and the energy sharing of the emitted photons. The effects of including higher (electric and magnetic) multipoles upon the emitted photon pairs beyond the electric-dipole approximation are also discussed. Calculations of the coefficients are performed for the transitions 2s 1/2→ 1s 1/2, 3d 3/2→1s 1/2, and 3d 5/2→1s 1/2, along the entire hydrogen isoelectronic sequence (1≤Z≤100).
AB - The spontaneous two-photon emission in hydrogenlike ions is investigated within the framework of second-order perturbation theory and Dirac's equation. Special attention is paid to the angular correlation of the emitted photons as well as to the degree of linear polarization of one of the two photons, if the second is just observed under arbitrary angles. Expressions for the angular correlation and the degree of linear polarization are expanded in powers of cosine functions of the two-photon opening angle, whose coefficients depend on the atomic number and the energy sharing of the emitted photons. The effects of including higher (electric and magnetic) multipoles upon the emitted photon pairs beyond the electric-dipole approximation are also discussed. Calculations of the coefficients are performed for the transitions 2s 1/2→ 1s 1/2, 3d 3/2→1s 1/2, and 3d 5/2→1s 1/2, along the entire hydrogen isoelectronic sequence (1≤Z≤100).
UR - http://www.scopus.com/inward/record.url?scp=84867530179&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.86.042509
DO - 10.1103/PhysRevA.86.042509
M3 - Article
AN - SCOPUS:84867530179
SN - 1050-2947
VL - 86
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 4
M1 - 042509
ER -