Rotational Dependence of Spin-Rotation and Hyperfine Splittings in theΣ122+Ground State of CaF

Abstract

The molecular-beam laser-rf double-resonance technique has been used to make high-precision measurements of the spin-rotation and hyperfine interactions in the $v^{\prime \prime }=0\mathrm{}$ vibrational level of the ${{}_{}{}^2{}_{}{}^{}\Sigma _{\frac{1}{2}}^{}{}_{}{}^{}}^{+}$ ground state of CaF. Both interactions exhibit a strong dependence on $N$, the rotational quantum number. The details of this $N$ dependence, neither observed nor explicitly predicted previously, are in accord with theory.