Reactions of size-selected platinum cluster ions, Pt_n~+ (n = 1-5), with small hydrocarbon molecules (CH_4, C_2H_6, C_2H_4, and C_2H_2) were studied in a beam-gas cell geometry at collision energies less than 1 eV employing a tandem mass spectrometer. It was found that dehydrogenation of the hydrocarbon molecules proceeds exclusively on Pt_n~+ and the absolute cross sections of the reactions depend critically on the cluster size, n, and the collision energy. The size- and the collision energy-dependent cross sections are successfully explained in an RRK framework.
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