Physics
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996phrvl..76...18s&link_type=abstract
Physical Review Letters, Volume 76, Issue 1, January 1, 1996, pp.18-21
Physics
87
Scientific paper
We have determined the frequency of the 3P1- 1S0 intercombination transition of atomic 40Ca stored in a magneto-optical trap to be ν = 455 986 240 493.95 kHz with an estimated standard uncertainty of 0.43 kHz \(δν/ν<10-12\) using a phase-coherent optical frequency chain from the Cs atomic clock to the visible. This allows the realization of the SI-unit meter according to its definition by visible radiation with 25-fold reduced uncertainty compared to previous measurements.
Helmcke J.
Lipphardt Burghard
Riehle Fritz
Schnatz Harald
Zinner G.
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