Single-trapped-ion frequency standards based on a 282 nm transition in 199Hg+ and on a 267 nm transition in
27Al+ have been developed at NIST over the past several years. Their frequencies are measured relative to each
other and to the NIST primary frequency standard, the NIST-F1 cesium fountain, by means of a self-referenced
femtosecond laser frequency comb. Both ion standards have demonstrated instabilities and inaccuracies of less
than 1 × 10-16.
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