Rotational-state selective nuclear magnetic resonance spectra of hydrogen in a molecular trap

A nuclear magnetic resonance (NMR) study of the molecular quantum dynamics of hydrogen trapped in solid C60 is presented. Rotational-state selective NMR spectra are shown. The analysis of the spectra provides a direct map of the molecular orientational probability distribution and of the rotational wave functions. Perturbations of the free rotor behavior due to rotor-phonon interactions and due to the S6 symmetry of the confining cage potential are discussed.