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Document Version Version Comment Date Status
299484.0 [No comment] 25.05.2010 11:01 Released

ID: 299484.0, MPI für Kernphysik / Theoretical Quantum Dynamics
Photoionization broadening of the 1S-2S transition in a beam of atomic hydrogen
Authors:Kolachevsky, Nikolai; Haas, Martin; Jentschura, Ulrich David; Herrmann, Maximilian; Fendel, Peter; Fischer, Marc; Holzwarth, Ronald; Udem, Thomas; Keitel, Christoph Helmut; Hänsch, Theodor W.
Date of Publication (YYYY-MM-DD):2006-11-15
Title of Journal:Physical Review A
Journal Abbrev.:Phys. Rev. A
Start Page:1
End Page:9
Sequence Number of Article:052504
Copyright:©2006 The American Physical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We consider the excitation dynamics of the two-photon 1S-2S transition in a beam of atomic hydrogen by 243 nm laser radiation. Specifically, we study the impact of ionization damping on the transition line shape, caused by the possibility of ionization of the 2S level by the same laser field. Using a Monte Carlo simulation, we calculate the line shape of the 1S-2S transition for the experimental geometry used in the two latest absolute frequency measurements [M. Niering et al., Phys. Rev. Lett. 84, 5496 (2000) and M. Fischer et al., Phys. Rev. Lett. 92, 230802 (2004)]. The calculated line shift and linewidth are in excellent agreement with the experimentally observed values. From this comparison we can verify the values of the dynamic Stark shift coefficient for the 1S-2S transition for the first time on a level of 15%. We show that the ionization modifies the velocity distribution of the metastable atoms, the line shape of the 1S-2S transition, and has an influence on the derivation of its absolute frequency.
External Publication Status:published
Document Type:Article
Communicated by:C.H. Keitel
Affiliations:MPI für Kernphysik/ Group of C.H. Keitel/Quantum Electrodynamics and High Precision Theory (U. D. Jentschura)
MPI für Quantenoptik
External Affiliations:P.N. Lebedev Physics Institute, Leninsky prosp. 53, 119991 Moscow, Russia
MenloSystems GmbH, Am Klopferspitz 19, 82152 Martinsried, Germany
Ludwig-Maximilians-University, Munich, Germany