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/.
The mercury single-ion optical clock and a test of the stability of the fundamental constants
2003-01-01
101189 byte
Conference paper
Electronic Resource
English
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