Hyperfine Structure of the Electronic Ground States ofRb85andRb87

Abstract

A study has been made of the ground states of ${\mathrm{Rb}}^{85}$ and ${\mathrm{Rb}}^{87}$ with a high-resolution atomic beam magnetic resonance apparatus. The hfs interactions have been measured to give $\Delta {\nu }_{85}=3\mathrm{}035732439\pm 5$ cps, $\Delta {\nu }_{87}=6\mathrm{}834682614\pm 3$ cps. The nuclear magnetic moment ${\mu }_I$ for ${\mathrm{Rb}}^{85}$ has been measured independently of $\Delta \nu$ by observing the separation between components of the doublet (3, -1) ↔ (2, -2) and (3, -2) ↔ (2, -1) near the frequency minimum. This frequency is given by $\delta \nu =2\mathrm{}{g}_I{\mu }_{0}H$. The value of ${\mu }_I$ is calculated to be 1.348 206(45) nm without diamagnetic correction or 1.352 70(25) nm with it.