Special Issue "High Precision Measurements of Fundamental Constants"

A special issue of Atoms (ISSN 2218-2004).

Deadline for manuscript submissions: closed (31 August 2017)

Special Issue Editor

Guest Editor
Dr. Joseph N. Tan

National Institute of Standards & Technology (NIST), 100 Bureau Drive, Gaithersburg, MD 20899, USA
Website | E-Mail
Interests: trapping, cooling, and spectroscopy of exotic ions; order in plasmas cooled to low temperature (& driven far from equilibrium); precision measurements and tests of QED or the standard model

Special Issue Information

Dear Colleagues,

Precision experiments with atomic systems provide an important avenue for testing our understanding of the laws of nature. Along with theoretical advances, they enable significant improvement in the determination of fundamental physical constants. As an example, a 13-fold improvement in the precision of the electron mass determination (relative uncertainty of 30 ppt) was obtained by interrogating a single 12C5+ hydrogen-like ion and accounting for higher-order effects from quantum electrodynamics (QED). A direct measurement of the magnetic moment of the proton by flipping its spin in a Penning trap has now surpassed the precision of an indirect determination from the spectrum of a hydrogen maser (a 42-year-old record). The most stringent test of QED is a comparison between prediction and measurement of the anomalous magnetic moment (g-2) of an electron, with an independent value of the fine structure constant (a) coming from a cold atom interferometer. Quantum interferometry of laser-cooled atoms has also provided a precise value of the Newtonian gravitational constant (G). Some other interesting works involve exotic atomic systems (antiprotonic helium, positronium, muonic hydrogen, etc.). In keeping with the advancing precision of measurements, certain physical constants will be selected to assume a far-reaching role in metrology. In 2018, the International System of Units (SI) is scheduled to undergo a framework revision wherein a set of seven exactly-defined fundamental constants would form the new basis for defining the SI units. This Special Issue highlights recent works, innovations and challenges in high precision measurements of fundamental constants.

Dr. Joseph N. Tan
Guest Editor

Manuscript Submission Information

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Published Papers (1 paper)

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Research

Open AccessArticle THz/Infrared Double Resonance Two-Photon Spectroscopy of HD+ for Determination of Fundamental Constants
Atoms 2017, 5(4), 38; doi:10.3390/atoms5040038
Received: 1 September 2017 / Revised: 1 October 2017 / Accepted: 6 October 2017 / Published: 12 October 2017
PDF Full-text (3729 KB) | HTML Full-text | XML Full-text
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
[...] Read more.
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. Full article
(This article belongs to the Special Issue High Precision Measurements of Fundamental Constants)
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