Zeitschrift für Physik A Atoms and Nuclei

, Volume 297, Issue 1, pp 35–39 | Cite as

A direct determination of the proton electron mass ratio

  • G. Gräff
  • H. Kalinowsky
  • J. Traut


The cyclotron frequencies of free protons and electrons in a magnetic field of 5.81 Tesla with superimposed electrostatic quadrupole field have been measured. The increase of energy connected with a transition at cyclotron frequency is detected by the measurement of the time of flight through an inhomogeneous magnetic field. From the ratio of the measured cyclotron frequencies of both particles the proton electron mass ratio is deduced. The resultmp/me=1,836.1527(11) agrees within the limits of error (0.6 ppm) with the value of the indirect determination.


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Copyright information

© Springer-Verlag 1980

Authors and Affiliations

  • G. Gräff
    • 1
  • H. Kalinowsky
    • 1
  • J. Traut
    • 1
  1. 1.Institut für Physik der Johannes Gutenberg-UniversitätMainzFederal Republic of Germany

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