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Search for an Electron Mass Shift in Cs133 in an Intense Electromagnetic Field

J. Richard Mowat*, Charles E. Johnson, and Howard A. Shugart

Vernon J. Ehlers

  • Department of Physics and Lawrence Radiation Laboratory, University of California, Berkeley, California 94720

  • Department of Physics, Calvin College, Grand Rapids, Michigan 49506

  • *Present Address: Department of Physics, Brandeis University, Waltham, Mass. 02154.
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Phys. Rev. D 3, 43 – Published 1 January, 1971

DOI: https://doi.org/10.1103/PhysRevD.3.43

Abstract

The possibility that the mass of a bound electron changes when placed in an intense electromagnetic field is studied here both theoretically and experimentally. The atomic-beam magnetic-resonance technique was used to examine hyperfine-structure frequency shifts in Cs133 that occur when the atom is subjected to an intense, nonresonant radio-frequency magnetic field perpendicular to the static "C" field. A 2921-MHz TM010 cavity produced the perturbing field and was situated between Ramsey separated oscillatory loops, which induced the resonant transitions of interest. Shifts were observed for six ΔmF=±1 transitions at field-independent points. No evidence was found for an electron mass shift. Good agreement is found between all observed shifts and those expected from a multilevel Bloch-Siegert effect.

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Phys. Rev. D 3, 43– Published 1 January, 1971
  • Received 10 November 1969

© 1971 American Physical Society

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