The use ofn‐capture gamma rays for studies of some topics in condensed matter physics is reviewed. These include the study of Debye temperatures of some metallic elements and molecular gases. Properties of 2‐dimensional systems such as adsorbed gases on graphite and also of graphite intercalated compounds are discussed in detail. In particular, the zero‐point energies of the vibrational and librational potentials of the molecules with respect to the adsorbing surfaces was determined.