Alkali-Metal Hyperfine Shift in the Van der Waals Molecule KAr

Abstract

The hyperfine interaction of K in KAr has been measured in several vibrational states of KAr. The results yield a value for the hyperfine shift $\alpha$ as a function of internuclear separation $R$ given by $\alpha =-115(R-R_0)$ kHz, where $R$ is in bohrs and $R_0=12.0\mathrm{}$ bohr, valid over the range $10.25 \mathrm{bohr}<R<\mathrm{}12.0\mathrm{} \mathrm{bohr}$.