The 1S-2S two-photon transition in singly ionized helium is a highly interesting candidate for precision tests of bound-state quantum electrodynamics (QED). With the recent advent of extreme ultraviolet frequency combs, highly coherent quasi-continuous-wave light sources at 61 nm have become available, and precision spectroscopy of this transition now comes into reach for the first time. We discuss quantitatively the feasibility of such an experiment by analyzing excitation and ionization rates, propose an experimental scheme, and explore the potential for QED tests.
M. Herrmann and M. K. Haas and U. D. Jentschura and F. Kottmann and D. Leibfried and G. Saathoff and C. Gohle and A. Ozawa and V. Batteiger and S. Knunz and N. N. Kolachevsky and H. A. Schussler and T. W. Hansch and T. H. Udem, "Feasibility of Coherent xuv Spectroscopy on the 1S-2S Transition in Singly Ionized Helium," Physical Review A - Atomic, Molecular, and Optical Physics, vol. 79, no. 5, pp. 052505-1-052505-15, American Physical Society (APS), May 2009.
The definitive version is available at https://doi.org/10.1103/PhysRevA.79.052505
Keywords and Phrases
Electrodynamics; Helium; Ionization Potential; Light; Light Sources; Quantum Electronics; Photoionization; Bound-state Quantum Electrodynamics; Experimental Scheme; Extreme Ultraviolet; Frequency Combs; Ionization Rates; Precision Spectroscopy; Quasi-continuous-wave; Two-photon Transitions; Xuv Spectroscopy
International Standard Serial Number (ISSN)
Article - Journal
© 2009 American Physical Society (APS), All rights reserved.