Hyperfine Structure and Nuclear Moments ofColumbium93

Measurements have been made on the hyperfine structure of 32 lines in the spectrum of CbI. Analysis of these structures supports the previously reported spin value of 4½ units for the ${\mathrm{Cb}}^{93}$ nucleus and yields 32 hyperfine interval factors. These data, when used in conjunction with semi-empirical formulas for the coupling between the nucleus and an $s$ electron in the configuration $4d^4 5s$, lead to values for the nuclear $g$-factor and nuclear magnetic moment of 1.18 and 5.3 nuclear magnetons, respectively, for stable ${\mathrm{Cb}}^{93}$. No nuclear electric quadrupole moment is detected.