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).
Negative-continuum effects on the two-photon decay rates of hydrogenlike ions
| Title | Negative-continuum effects on the two-photon decay rates of hydrogenlike ions |
| Publication Type | Journal Article |
| Year of Publication | 2009 |
| Authors | Surzhykov, A., Santos J. P., Amaro P., and Indelicato P. |
| Journal | Physical Review A (Atomic, Molecular, and Optical Physics) |
| Volume | 80 |
| Pagination | 052511 |
| Keywords | atomic structure, Dirac equation, hydrogen neutral atoms, perturbation theory, relativistic corrections, spontaneous emission, uranium, xenon |
| Abstract | Two-photon decay of hydrogenlike ions is studied within the framework of second-order perturbation theory, based on the relativistic Dirac's equation. Special attention is paid to the effects arising from the summation over the negative-energy (intermediate virtual) states that occur in such a framework. In order to investigate the role of these states, detailed calculations have been carried out for the 2s1/2-->1s1/2 and 2p1/2-->1s1/2 transitions in neutral hydrogen H as well as for hydrogenlike xenon Xe53+ and uranium U91+ ions. We found that for a correct evaluation of the total and energy-differential decay rates, summation over the negative-energy part of Dirac's spectrum should be properly taken into account both for high-Z and low-Z atomic systems. |
| URL | http://link.aps.org/abstract/PRA/v80/e052511 |
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