Determination of γP at the National Bureau of Standards

  • P. T. Olsen
  • R. L. Driscoll


The gyromagnetic ratio of the proton, γP is one of our most important fundamental physical constants. (The prime indicates that the protons are in a spherical sample of pure H2O.) Not only is it used for calibration purposes in nuclear magnetic resonance experiments, but it plays a crucial role in determining the fine structure constant from the measurement of 2e/h via the ac Josephson effect (1). Additionally the continued measurement of γP can be used to monitor as-maintained units of current (2).


Angular Position Nuclear Magnetic Resonance Experiment Diameter Variation Frequency Synthesizer Precession Frequency 
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    DRISCOLL, R. L., and OLSEN, P. T., Proc. Int. Conf. on Prec. Meas. and Fund. Constants, edited by D. N. Langenberg and B. N. Taylor (NBS Spec. Pub. 343, USGPO, Washington, D. C., 1971 ), p. 117.Google Scholar
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    ABRAGAM, A., Principles of Nuclear Magnetism (Clarendon Press, Oxford, England, 1961).Google Scholar
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    SNOW, C., and DRISCOLL, R. L., J. Res. Nat. Bur. Stds. 69c, 49 (1965).Google Scholar
  6. 6.
    Where applicable, unless the word “observed” is used, a judgment estimated to be equivalent to one standard deviation is meant.Google Scholar

Copyright information

© Plenum Publishing Company Ltd 1972

Authors and Affiliations

  • P. T. Olsen
    • 1
  • R. L. Driscoll
    • 1
  1. 1.Institute for Basic StandardsNational Bureau of StandardsUSA

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