Results of the measurements which compare the frequency /spl nu//sub Hg/ of the /sup 199/Hg/sup +2/ S/sub 1/2/ (F=0) - /sup 2/D/sub 1/2/ (F=2, m/sub F/=0) optical transition to the SI second as realized at NIST are reported. Since the NIST time scale is calibrated with a cesium fountain primary frequency standard, the ratio of /spl nu//sub Hg/ ( /spl ap/ 10/sup 15/ Hz) to the cesium ground-state hyperfine splitting /spl nu//sub Cs/ (/spl ap/ 9.2 GHz) is measured. These measurements show better reproducibility than 10 Hz at /spl nu//sub Hg/, and constrain any possible variation of the ratio /spl nu//sub Hg/ //spl nu//sub Cs/ to /spl plusmn/ 7/spl middot/10/sup -15/ yr/sup -1/.


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    Title :

    The mercury single-ion optical clock and a test of the stability of the fundamental constants


    Contributors:
    Bize, S. (author) / Diddams, S.A. (author) / Tanaka, U. (author) / Tanner, C.E. (author) / Oskay, W.H. (author) / Parker, T. (author) / Drullinger, R.E. (author) / Heavner, T. (author) / Jefferts, S.R. (author) / Hollberg, L. (author)


    Publication date :

    2003-01-01


    Size :

    101189 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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