The proposal seeks to characterise spectroscopic blueprints of structural changes inferred from the reverse-Monte Carlo (RMC) analysis of the elastic structure factors in Rare-earth molybdates (ReMs), by going beyond the set of conventionally applied techniques such as ND and inelastic neutron spectroscopy (INS). In doing so, we believe that correlation in effective atomic structure will manifest itself as systematic contributions to the Doppler broadening of the mass-resolved recoil peaks observed in neutron Compton scattering (NCS). NCS proves itself very useful here, as the Doppler broadening is an observable NCS feature, no matter the character of the underlying degrees of freedom contributing to the vibrational density of states.