Figure 1.

(Left) Mass spectra of the desorption products observed during ion beam irradiation of Pt(¹³CO)₂Cl₂. The film was irradiated with a 3.0 kV Ar⁺ beam at a flux of 100 nA. The bottom panel indicates the gas composition of the UHV chamber with 1.5 × 10⁻⁷ Torr Ar prior to irradiation (the peaks at m/z 40 and m/z 20 correspond to, respectively, Ar⁺ and Ar²⁺ ions formed by electron impact ionization of neutral Ar in the QMS). The top panel displays the gas phase species observed during the film’s exposure to 4.0 µC/cm² Ar⁺, corresponding to an acquisition time of 30 s. (Right) Kinetic profile for ¹³CO production observed at m/z 29 for two different ion fluxes. The inset shows the linearization of the kinetic decay profiles with the corresponding fits for a first-order decay process.