Study of oxygen-C-60 compound formation by NEXAFS and RIXS

The interaction of oxygen with C-60 molecules was studied on a C-60 film wh ich had been exposed simultaneously to oxygen and UV-light for 190 hours, p roducing an approximately C60O1 stoichiometry in the bulk of the sample. C K-edge and O K-edge NEXAFS (using total fluorescence yield detection) and r esonant X-ray inelastic scattering (RIXS) spectra from the sample film were measured and the C K-edge data were compared to the spectra from pristine C-60 as reference. The C K-edge absorption and emission spectral profiles o f the oxygen-doped sample are similar to those of the C-60 reference, sugge sting that cage breaking of C-60 under these conditions, if any, is negligi ble. However, the redistribution of intensities in the spectra indicates ch anges in the occupancies of different molecular orbitals, possibly due to c hanges in electron density upon reaction. Similarities of the O K-edge soft X-ray emission (SXES) spectra to several small oxygen-containing molecules is being discussed in terms of bonding models.