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Present Status of our Knowledge of the Numerical Values of the Fundamental Physical Constants

  • E. Richard Cohen
  • J. W. M. DuMond
Conference paper

Abstract

In 1955 we published a least squares adjustment of the fundamental atomic constants1. Since that time several corrections and revisions2–5 have been applied to the 1955 data, but no complete reanalysis had been made. We have now completed a new analysis of all of the old data and of the host of new data which has become available since 1955. The present adjustment includes several new measurements of physical constants such as the Faraday, the magnetic moment of the proton, and the proton gyromagnetic ratio. In addition, new measurements of the fine structure constant, α, indicate new experimental relationships among the physical constants which have been determined with sufficient accuracy that they warrant inclusion in any future adjustment. The present adjustment is based on data which was available in 1962. Some results which have come to our attention since then have been used only as confirmatory evidence to support our conclusions, but have not been analyzed in detail, in some cases because of lack of complete information concerning calibration standards, in other cases merely because we received the information too late for inclusion.

Keywords

Gyromagnetic Ratio Bohr Magneton Fine Structure Constant Fundamental Physical Constant Nuclear Magneton 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag/Wien 1964

Authors and Affiliations

  • E. Richard Cohen
    • 1
  • J. W. M. DuMond
    • 2
  1. 1.North American Aviation Science CenterCanoga ParkUSA
  2. 2.California Institute of TechnologyPasadenaUSA

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