EGAS41 - Swansea University

41 st EGAS CP 15 Gdańsk 2009
Nonresonant corrections for the optical resonance frequency
measurements in hydrogen atom
L. Labzowsky 1,2 , G. Schedrin 1 , D. Solovyev 1 , E. Chernovskaya 1,∗ ,
G. Plunien 3 , S. Karshenboim 4,5
1 V.A. Fock Institute of Physics, St. Petersburg State University, 198904, Uljanovskaya 1,
Petrodvorets, St. Petersburg, Russia
2 Petersburg Nuclear Physics Institute, 188350, Gatchina, St. Petersburg, Russia
3 Institut für Theoretische Physik, Technische Universität Dresden, Mommsenstrasse 13,
D-01062, Dresden, Germany
4 D.I. Mendeleev Institute for Metrology, St. Petersburg, 190005, Russia
5 Max-Planck Institut für Quantenoptik, Garching, 85748, Germany
∗ Corresponding author: jkfizfak@rambler.ru
The deviation of the natural spectral line profile from the Lorentz shape for the optical
resonant frequency measurements is considered. This deviation leads to an asymmetry,
which is mainly due to nonresonant correction to the resonant Lorentz profile. The nonresonant
corrections are studied for the different types of the atomic resonant experiments
[1,2]. The most accurate recent optical resonance experiments [3,4] are analyzed, i.e. the
two-photon 1s–2s resonance excitation of the hydrogen atom with the delayed decay in
the external electric field. The description of the nonresonant correction in the latter case
requires the employment of QED with different in- and out-Hamiltonians.
The nonresonant corrections for this experiment are investigated and found to be
about 10 −5 Hz, while the recent experimental uncertainty is 34 Hz and in the near feature
is expected to be few Hz. The projected 1s–2s resonance excitation experiment with the
three-photon ionization detection (which is now in progress) is also considered.
References
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(2001); Can. J. Phys. 80, 1187 (2002); Phys. Rev. A 65, 05 02 (2002)
[2] L. Labzowsky, G. Schedrin, D. Solovyev, G. Plunien, Phys. Rev. Lett. 98, 203003
(2007)
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M.Niering, R. Holzwarth, J. Reichert, P. Pokasov, Th. Udem, M.Weitz, T.W. Hänsch,
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C.H. Keitel, Phys. Rev. Lett. 92, 230802 (2004)
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