Two-Phonon Decay and Lifetime of the 22S12 State of Hydrogenlike Argon

Details Two-Phonon Decay and Lifetime of the 22S12 State of Hydrogenlike Argon Two-Phonon Decay and Lifetime of the 22S12 State of Hydrogenlike Argon

Dec 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970phrvl..25.1692s&link_type=abstract

Physical Review Letters, vol. 25, Issue 25, pp. 1692-1695

Physics

17

Scientific paper

The lifetime of the 22S12 state of the hydrogenlike atom Ar XVIII has been measured by direct observation of spontaneous two-photon decay in a beam-foil time-of-flight experiment. Identification of the two-photon mode was made using photon counting techniques to observe the single-photon continuum, and the peak resulting from summing the energies of photon pairs detected in coincidence. The measured lifetime, τ(22s12)=3.54(25)×10-9 sec (95% confidence) is in excellent agreement with theoretical predictions based on a nonrelativistic calculation.

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