First high-resolution spectroscopy of 201Hg+ hyperfine structure: a sensitive probe of nuclear structure and the hyperfine anomaly

摘要

Using 201Hg+ contained within a linear quadrupole rf ion trap that is part ofan atomic clock, we report the first high-resolution spectroscopy on thehyperfine structure of 201Hg+. We measure the absolute ground state hyperfineinterval to be 29.954365821130(171)(62)(10) GHz, more than 8 orders ofmagnitude improvement over the previous measurement. The first error estimatein parentheses is the statistical error in the shifted line center measurement,the second is systematic uncertainty, and the third is calibration uncertaintyin the hydrogen maser reference standard. By comparison to the alreadyaccurately known ground state hyperfine interval for 199Hg+, we are able toderive a new value for the hyperfine anomaly in singly ionized mercury,Delta(S1/2, 199Hg+, 201Hg+) = -0.0016257(5), now limited by knowledge of thenuclear magnetic moment ratio.