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High Resolution Penning Trap as a Precision Mass-Ratio Spectrometer

  • Robert S. Van DyckJr.
  • Paul B. Schwinberg
  • Samuel H. Bailey

Abstract

The compensated Penning trap1 with characteristic dimensions RO and ZO is a D.C. electric potential cage located in a strong axial magnetic field and as such is an ideal apparatus for isolating long lived charged particles, nearly at rest (thermalized by a cryogenic environment) and essentially free of other-particle interactions (due to the ultra-high vacuum used, ≪10-10 Torr). The ability to determine mass arises from the inverse mass dependence of the various motions in the trap. The first such motion is the axial electric resonance (motion along axis of symmetry) at
$${v_{z}} = (1/2\pi ){(e{V_{0}}/mZ_{0}^{2})^{{\frac{1}{2}}}}$$
which is often used to monitor the presence of the trapped charge, but is only appropriate for very low precision mass measurements since the effective applied D.C. potential, VO will often depend on parameters which are difficult to control (i.e. thermal emf’, contact potentials, patch effects, time varying dimensions, dielectric polarization, unstable power supply, etc.). In contrast to the axial resonance, the magnetic cyclotron frequency at
$${v_{c}} = (1/2\pi )(e{B_{0}}/mc)$$

Keywords

Cyclotron Frequency Electron Cyclotron Resonance Axial Magnetic Field Axial Resonance Trap Parameter 
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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References

  1. 1.
    R. S. Van Dyck, Jr., D. J. Wineland, P. A. Ekstrom, and H. G. Dehmelt, High Resolution with a New Variable Anharmonicity Penning Trap, Appl Phys. Letters 28, 446 (1976).ADSCrossRefGoogle Scholar
  2. 2.
    Robert S. Van Dyck, Jr., Paul B. Schwinberg, and Hans G. Dehmelt, Electron Magnetic Moment from. Geonium Spectra, in “New Frontiers in High-Energy Physics,” B. Kursunoglu, A. Perlmutter, and L. F. Scott, eds., Plenum Press, New York (1978).Google Scholar
  3. 3.
    P. B. Schwinberg, R. S. Van Dyck, Jr., and H. G. Dehmelt, Preliminary Positron/Electron Mass Ratio Measurement in a Compensated Penning Trap, to be published in Bull. Am. Phys. Soc.Google Scholar
  4. 4.
    P. B. Schwinberg, R. S. Van Dyck, Jr., and H. G. Dehmelt, A Variable Magnetic Bottle for Geonium Measurements, to be published in Bull. Am. Phys. Soc.Google Scholar

Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • Robert S. Van DyckJr.
    • 1
  • Paul B. Schwinberg
    • 1
  • Samuel H. Bailey
    • 1
  1. 1.Physics DepartmentUniversity of WashingtonSeattleUSA

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