Observation of mixing between singlet and triplet scattering channels in Rb2 Rydberg molecules
A systematic study of the hyperfine structure of 5snd1D2 and 3D2 states of 87Sr was carried out by Doppler-free two-photon excitation. In the region of strong singlet-triplet mixing around n=16, the hyperfine structure exhibits a marked n dependence which is related to the amount of singlet-triplet mixing.