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High-Precision Atomic Mass Measurements for Fundamental Constants

Department of Physics, Florida State University, Tallahassee, FL 32306-4350, USA
Atoms 2019, 7(1), 37;
Received: 4 January 2019 / Revised: 12 February 2019 / Accepted: 28 February 2019 / Published: 18 March 2019
(This article belongs to the Special Issue High Precision Measurements of Fundamental Constants)
PDF [327 KB, uploaded 18 March 2019]


Atomic mass measurements are essential for obtaining several of the fundamental constants. The most precise atomic mass measurements, at the 10−10 level of precision or better, employ measurements of cyclotron frequencies of single ions in Penning traps. We discuss the relation of atomic masses to fundamental constants in the context of the revised SI. We then review experimental methods, and the current status of measurements of the masses of the electron, proton, neutron, deuteron, tritium, helium-3, helium-4, oxygen-16, silicon-28, rubidium-87, and cesium-133. We conclude with directions for future work. View Full-Text
Keywords: atomic mass; fundamental constants; precision measurement; Penning trap atomic mass; fundamental constants; precision measurement; Penning trap
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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Myers, E.G. High-Precision Atomic Mass Measurements for Fundamental Constants. Atoms 2019, 7, 37.

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