Relativistic calculation of the two-photon decay rate of highly excited ionic states
- Citation data:
Physical Review A, ISSN: 1050-2947, Vol: 77, Issue: 4, Page: 42507-42507
- Publication Year:
- Physics and Astronomy; Electrodynamics; Excited States; Quantum Theory; Resonance; Neutral Hydrogen; Quantum Electrodynamics; Two Photon Processes; Electrodynamics; Excited States; Quantum Theory; Resonance; Neutral Hydrogen; Quantum Electrodynamics; Two Photon Processes; Physics
Based on quantum electrodynamics, we reexamine the two-photon decay of one-electron atoms. Special attention is paid to the calculation of the (two-photon) total decay rates which can be viewed as the imaginary part of the two-loop self-energy. We argue that our approach can be easily applied to the cases with a virtual state having an intermediate energy between the initial and the final state of the decay process leading, thus, to the resonance peaks in the two-photon energy distribution. In order to illustrate our approach, we obtain fully relativistic results, resolved into electric and magnetic multipole components, for the two-photon decay rates of the 3 S1/2 →1 S1/2 transition in neutral hydrogen as well as in various hydrogenlike ions. © 2008 The American Physical Society.