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Atoms 2017, 5(4), 48; doi:10.3390/atoms5040048

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

Department of Physics, Missouri University of Science and Technology, Rolla, MO 65409, USA
Author to whom correspondence should be addressed.
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)
View Full-Text   |   Download PDF [801 KB, uploaded 24 November 2017]


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
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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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