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physics.atom-ph2015★ 30 cited
Observation of positronium annihilation in the 2S state: towards a new measurement of the 1S-2S transition frequency
D. A. Cooke, P. Crivelli, J. Alnis +8
We report the first observation of the annihilation of positronium from the 2S state. Positronium (Ps) is excited with a two-photon transition from the 1S to the 2S state where its…
physics.atom-ph2006
Precision study of hyperfine structure in simple atoms
S. Karshenboim, S. Eidelman, P. Fendel +4
We consider the most accurate tests of bound state QED theory of the hyperfine splitting in two-body atoms related to the HFS interval of the 1s state in muonium and positronium an…
physics.atom-ph2005★ 19 cited
Compact solid-state laser source for 1S-2S spectroscopy in atomic hydrogen
N. Kolachevsky, J. Alnis, S. D. Bergeson +1
We demonstrate a novel compact solid-state laser source for high-resolution two-photon spectroscopy of the transition in atomic hydrogen. The source emits up to 20 mW at 24…