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Thin films of a-Si 0.8 C 0.2 :H are deposited by ion beam sputtering combined with the simultaneous irradiation of hydrogen atoms delivered by a thermal hydrogen atom source. Elemental composition and bonding structure of the films are analysed by XPS, RBS, ERD, and FTIR. The hydrogen concentration can be varied in a controlled manner. Up to concentrations of 5%, the hydrogen is exclusively incorporated in single Si–H bonds.