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Atoms 2017, 5(4), 38; doi:10.3390/atoms5040038

THz/Infrared Double Resonance Two-Photon Spectroscopy of HD+ for Determination of Fundamental Constants

Laboratoire PhLAM, CNRS UMR 8523, 59655 Villeneuve d’Ascq, France
Received: 1 September 2017 / Revised: 1 October 2017 / Accepted: 6 October 2017 / Published: 12 October 2017
(This article belongs to the Special Issue High Precision Measurements of Fundamental Constants)
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Abstract

A double resonance two-photon spectroscopy scheme is discussed to probe jointly rotational and rovibrational transitions of ensembles of trapped HD+ ions. The two-photon transition rates and lightshifts are calculated with the two-photon tensor operator formalism. The rotational lines may be observed with sub-Doppler linewidth at the hertz level and good signal-to-noise ratio, improving the resolution in HD+ spectroscopy beyond the 10−12 level. The experimental accuracy, estimated at the 10−12 level, is comparable with the accuracy of theoretical calculations of HD+ energy levels. An adjustment of selected rotational and rovibrational HD+ lines may add clues to the proton radius puzzle, may provide an independent determination of the Rydberg constant, and may improve the values of proton-to-electron and deuteron-to-proton mass ratios beyond the 10−11 level. View Full-Text
Keywords: two-photon spectroscopy; hyperfine structure; two-photon lightshift; trapped ions; Rydberg constant; proton-to-electron mass ratio; deuteron-to-proton mass ratio; proton radius; deuteron radius two-photon spectroscopy; hyperfine structure; two-photon lightshift; trapped ions; Rydberg constant; proton-to-electron mass ratio; deuteron-to-proton mass ratio; proton radius; deuteron radius
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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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Constantin, F.L. THz/Infrared Double Resonance Two-Photon Spectroscopy of HD+ for Determination of Fundamental Constants. Atoms 2017, 5, 38.

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