Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

A: Fachverband Atomphysik

A 15: Poster I

A 15.25: Poster

Dienstag, 3. März 2009, 16:30–19:00, VMP 9 Poster

Improved measurement of the 2S hyperfine splitting in atomic hydrogen and 1S-2S isotopic shift in deuterium — •Janis Alnis, Arthur Matveev, Nikolay Kolachevsky, and Theodor Hänsch — MPI of Quantum Optics, Garching near Munich

Atomic hydrogen is the simplest atom that can be calculated theoretically with great precision and better experimental data allow to make higher order Quantum Electrodynamics (QED) corrections. In 2008 we have performed a series of measurements allowing to improve the precision of a 2S hyperfine structure (HFS) interval more than two times comparing to the 2004 result [1] and the new value is 177556834.3(6.7) Hz [2]. An important improvement was to perform measurements using two independent stable laser systems simultaneously. The spectroscopy laser was scanned sequentially across the singlet and the triplet 1S-2S two-photon transitions while the reference laser [3] was all the time locked to a stable Fabry-Perot cavity. This method allowed to detect immediately any instabilities in spectroscopy laser frequency during the laser scanning and re-locking. As a next step we propose to re-measure the isotopic shift of the 1S-2S transition between atomic hydrogen and deuterium.

1. N. Kolachevsky, et al., Phys. Rev. Lett. 92, 033003 (2004)

2. N. Kolachevsky et al., arxiv.org

3. J. Alnis et al. Phys. Rev. A. 77, 053809 (2008)