CFA FCT/UNL is one of the two scientific groups of Centro de Física Atómica (CFA). Most of its members belong to Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa (FCTUNL).
Resonance effects on the two-photon emission from hydrogenic ions
| Title | Resonance effects on the two-photon emission from hydrogenic ions |
| Publication Type | Journal Article |
| Year of Publication | 2009 |
| Authors | Amaro, P., Santos J. P., Parente F., Surzhykov A., and Indelicato P. |
| Journal | Physical Review A (Atomic, Molecular, and Optical Physics) |
| Volume | 79 |
| Pagination | 062504 |
| Keywords | bound states, Dirac equation, quantum electrodynamics, radiative lifetimes, two-photon processes |
| Abstract | A theoretical study of the all two-photon transitions from initial bound states with ni=2,3 in hydrogenic ions is presented. High-precision values of relativistic decay rates for ions with nuclear charge in the range 1<=Z<=92 are obtained through the use of finite basis sets for the Dirac equation constructed from B splines. We also report the spectral (energy) distributions of several resonant transitions, which exhibit interesting structures, such as zeros in the emission spectrum, indicating that two-photon emission is strongly suppressed at certain frequencies. We compare two different approaches (the line profile approach and the QED approach based on the analysis of the relativistic two-loop self-energy) to regularize the resonant contribution to the decay rate. Predictions for the pure two-photon contributions obtained in these approaches are found to be in good numerical agreement. |
| URL | http://link.aps.org/abstract/PRA/v79/e06250 |
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