Stuttgart 2012 – wissenschaftliches Programm
Q 34.86: Poster
Dienstag, 13. März 2012, 16:30–19:00, Poster.I+II
Precision spectroscopy of atomic hydrogen: 2s-4p transition — Axel Beyer1, Arthur Matveev1, Christian G. Parthey1, Nikolay Kolachevsky1, •Janis Alnis1, Thomas Udem1, 2, and Theodor W. Hänsch1, 2 — 1MPI of Quantum Optics, 85748 Garching — 2Ludwig-Maximilians-University, 80799 Munich
Atomic hydrogen is the simplest atom allowing to make stringent tests of bound state QED. 1s-2s transition frequency measurement in atomic hydrogen has recently been evaluated with 4.2 × 10−15 uncertainty or 2 466 061 413 187 035 (10) Hz for the hyperfine centroid .
As a next task we will re-measure more precisely transitions between higher-lying states. In the present contribution we will report on measurements of a single-photon transition between the 2s and 4p states.
Measurement of several transition frequencies in atomic hydrogen could possibly help to understand the discrepancy between proton charge radius obtained from muonic hydrogen experiment  and the CODATA 2010 value.
 C.G. Parthey et al., Phys. Rev. Lett. 107, 203001 (2011)
 R. Pohl et al., Nature 466, 7303 (2010).