PSAS 2012
International Conference on Precision Physics
of Simple Atomic Systems 2012
Eltville, Germany -
Information

Title:	Mr.
Family Name:	Beyer
First Name:	Axel
Gender:	male
E-Mail:	axel.beyermpq.mpg.de
Affiliation for Badge:	MPQ
Institute:	Max Planck Institute of Quantum Optics
Address (Street):	Hans-Kopfermann-Str. 1
Postal Code, City:	D-85748 Garching
Country:	Germany
Phone:	(+ 49 89) 3 29 05 - 334
Fax:	(+ 49 89) 3 29 05 - 200
Arrival Date:	June 10
Departure Date:	June 15
Excursion with Conference Dinner:	Selected
Payment:	Bank transfer to GSI
Title:	Precision spectroscopy of the 2S-4P transition in atomic hydrogen (Poster)
Abstract:	The comparison between measured and calculated transition frequencies in atomic hydrogen can provide stringent tests of bound state QED. For the last decade, this comparison has been limited by the proton charge radius determined by electron-proton scattering. Recently, laser spectroscopy of muonic hydrogen provided a value, which is ten times more accurate than any previous measurement. But this value differs from the CODATA 2010 value, obtained by a global adjustment of fundamental constants using data from electron-proton scattering and hydrogen experiments for the proton charge radius, by seven standard deviations. The muonic hydrogen result led to a comprehensive search for the cause of this discrepancy, but no convincing argument could be found so far. Because the current CODATA value is mainly based on observations in atomic hydrogen, transition frequency measurements with improved accuracy can help to solve this puzzle or at least to rule out hydrogen experiments as a possible source for the discrepancy. In this poster presentation we report on the setup which has been developed for the measurement of the one-photon $\mathrm{2S_{1/2}}$-$\mathrm{{4P_{1/2}}}$ transition frequency in atomic hydrogen along with the results and conclusions of our first measurement runs.

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