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

Autor:	L. Venturelli, S. Friedreich, Andreas Dax, Ryugo S. Hayano, D. Barna, Anna Sótér, T. Pask, Dezso Horvath, E. Widmann, Masaki Hori, B. Juhász, Nicola Zurlo
Rok vydání:	2013
Předmět:	Physics chemistry.chemical_element Atomic and Molecular Physics and Optics Spectral line symbols.namesake chemistry Antiproton Antimatter symbols Physics::Accelerator Physics Physics::Atomic Physics Atomic physics Spectroscopy Antiprotonic helium Doppler effect Helium Doppler broadening
Zdroj:	Few-Body Systems. 54:917-922
ISSN:	1432-5411 0177-7963
DOI:	10.1007/s00601-013-0653-x
Popis:	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 10 9 . By comparing the results with three-body QED calculations, the antiproton-to-electron mass ratio was derived as 1836.1526736(23).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6e5dd5f89b6969e04538a919d847b8de https://doi.org/10.1007/s00601-013-0653-x Zobrazit plný text záznamu Plný text ve formátu PDF