In this paper, we report results on the interaction of 400 keV H + ions with thin C 6 0 films focusing on post-irradiation ageing effects. Infrared spectroscopy and resonant α-scattering have been used for characterization of the targets. The analysis were made at different times after bombardment during a period of several months. It has been observed that the signal from the characteristic C 6 0 IR bands decrease up to 50-70% after the first post-irradiation analysis of the targets. Such ageing is correlated to the appearance and evolution of the oxygen signal in the resonant α-scattering spectra, as well as to the presence of carbonyl bands in the IR spectra of aged targets. For a fixed ageing time the intensity of C 6 0 IR bands decrease exponentially as a function of fluence.