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9 papers · 2 filters
Pair production in laser fields oscillating in space and time
Matthias Ruf, Guido R. Mocken, Carsten Müller +2
The production of electron-positron pairs from vacuum by counterpropagating laser beams of linear polarization is calculated. In contrast to the usual approximate approach, the spa…
Virtual Resonant States in Two-Photon Decay Processes: Lower-Order Terms, Subtractions, and Physical Interpretations
Ulrich D. Jentschura
We investigate the two-photon decay rate of a highly excited atomic state which can decay to bound states of lower energy via cascade processes. We show that a naive treatment of t…
Reexamining Black-Body Shifts for Hydrogenlike Ions
U. D. Jentschura, M. Haas
We investigate black-body induced energy shifts for low-lying levels of atomic systems, with a special emphasis on transitions used in current and planned high-precision experiment…
Relativistic calculation of the two-photon decay rate of highly-excited ionic states
Ulrich D. Jentschura, Andrey Surzhykov
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…
Two-Photon Decays Reexamined: Cascade Contributions and Gauge Invariance
Ulrich D. Jentschura
The purpose of this paper is to calculate the two-photon decay rate corresponding to the two-photon transitions nS->1S and nD->1S in hydrogenlike ions with a low nuclear charge num…
Nuclear-resonant electron scattering
Adriana Pálffy, Zoltán Harman
We investigate nuclear-resonant electron scattering as occurring in the two-step process of nuclear excitation by electron capture (NEEC) followed by internal conversion. The nucle…