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Open AccessFeature PaperArticle

Long-Range Interactions for Hydrogen: 6P–1S and 6P–2S Systems

Department of Physics, Missouri University of Science and Technology, Rolla, MO 65409, USA
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Atoms 2017, 5(4), 48; https://doi.org/10.3390/atoms5040048
Received: 30 August 2017 / Revised: 24 October 2017 / Accepted: 16 November 2017 / Published: 23 November 2017
(This article belongs to the Special Issue High Precision Measurements of Fundamental Constants)
The collisional shift of a transition constitutes an important systematic effect in high-precision spectroscopy. Accurate values for van der Waals interaction coefficients are required in order to evaluate the distance-dependent frequency shift. We here consider the interaction of excited hydrogen 6 P atoms with metastable atoms (in the 2 S state), in order to explore the influence of quasi-degenerate 2 P and 6 S states on the dipole-dipole interaction. The motivation for the calculation is given by planned high-precision measurements of the transition. Due to the presence of quasi-degenerate levels, one can use the non-retarded approximation for the interaction terms over wide distance ranges. View Full-Text
Keywords: long-range interactions; quasi-degenerate states; hyperfine levels; matrix element; interatomic interactions long-range interactions; quasi-degenerate states; hyperfine levels; matrix element; interatomic interactions
MDPI and ACS Style

Jentschura, U.D.; Adhikari, C.M. Long-Range Interactions for Hydrogen: 6P–1S and 6P–2S Systems. Atoms 2017, 5, 48.

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