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500-Hz two-photon Ramsey fringes with a SF6 beam: towards a new frequency standard in the 30-THz spectral region |
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| Authors: | A. Shelkovnikov Ch. Grain C.T. Nguyen R.J. Butcher A. Amy-Klein Ch. Chardonnet |
| Affiliation: | (1) Laboratoire de Physique des Lasers, UMR 7538 C.N.R.S. Université Paris 13, 99, av. J.-B. Clément, 93430 Villetaneuse, France, FR;(2) P.N. Lebedev Physical Institute, Leninsky Prospect, 53, Moscow 117924, Russia, RU;(3) The Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE, UK, GB |
| Abstract: | A two-photon Ramsey-fringe experiment with a supersonic beam of SF6 has been performed with an interzone distance of up to 50 cm. Using a He-seeded beam with 50% of SF6, the two-photon transition P(4)E0 in the 2ν3 band reveals its magnetic hyperfine structure and the periodicity of the fringes is 500 Hz. The strength of the central fringe of the main hyperfine component corresponds to a flux of 1010–1011useful molecules/s, which is very promising for a new frequency standard in the 30-THz spectral region. Received: 27 April 2001 / Revised version: 18 June 2001 / Published online: 18 July 2001 |
| Keywords: | PACS: 33.20.Ea 42.62.Fi 42.62.Eh |
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