Sub-Doppler Two-Photon Laser Spectroscopy of Antiprotonic Helium and the Antiproton-to-Electron Mass Ratio

M. Hori, A. Sótér, D. Barna, A. Dax, R. S. Hayano, S. Friedreich, B. Juhász, T. Pask, E. Widmann, D. Horváth, L. Venturelli, N. Zurlo

Research output: Contribution to journalArticle

Abstract

The ASACUSA collaboration of CERN has recently irradiated antiprotonic helium atoms with two counter-propagating laser beams. This excited some non-linear two-photon transitions of the antiproton at the deep UV wavelengths λ = 139.8-197.0 nm. The counterpropagating geometry of the laser beams reduced the thermal Doppler broadening of the observed resonances. Their narrow spectral lines allowed the measurement of three transition frequencies with fractional precisions of 2.3-5 parts in 109. By comparing the results with three-body QED calculations, the antiproton-to-electron mass ratio was derived as 1836.1526736(23).

Original languageEnglish
Pages (from-to)917-922
Number of pages6
JournalFew-Body Systems
Volume54
Issue number7-10
DOIs
Publication statusPublished - Aug 2013

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electron mass
antiprotons
laser spectroscopy
mass ratios
helium
laser beams
photons
helium atoms
line spectra
counters
geometry
wavelengths

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Sub-Doppler Two-Photon Laser Spectroscopy of Antiprotonic Helium and the Antiproton-to-Electron Mass Ratio. / Hori, M.; Sótér, A.; Barna, D.; Dax, A.; Hayano, R. S.; Friedreich, S.; Juhász, B.; Pask, T.; Widmann, E.; Horváth, D.; Venturelli, L.; Zurlo, N.

In: Few-Body Systems, Vol. 54, No. 7-10, 08.2013, p. 917-922.

Research output: Contribution to journalArticle

Hori, M, Sótér, A, Barna, D, Dax, A, Hayano, RS, Friedreich, S, Juhász, B, Pask, T, Widmann, E, Horváth, D, Venturelli, L & Zurlo, N 2013, 'Sub-Doppler Two-Photon Laser Spectroscopy of Antiprotonic Helium and the Antiproton-to-Electron Mass Ratio', Few-Body Systems, vol. 54, no. 7-10, pp. 917-922. https://doi.org/10.1007/s00601-013-0653-x
Hori, M. ; Sótér, A. ; Barna, D. ; Dax, A. ; Hayano, R. S. ; Friedreich, S. ; Juhász, B. ; Pask, T. ; Widmann, E. ; Horváth, D. ; Venturelli, L. ; Zurlo, N. / Sub-Doppler Two-Photon Laser Spectroscopy of Antiprotonic Helium and the Antiproton-to-Electron Mass Ratio. In: Few-Body Systems. 2013 ; Vol. 54, No. 7-10. pp. 917-922.
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