The influence of lateral interactions on the angular distribution in photodesorption.
Photodesorption and photodissocn. are induced when O2 adsorbed on Pd (111) is irradiated with UV light. Both processes are nonthermal. Thermal desorption of mol. O is obsd. as a consequence of a displacement process by the nascent at. O. Angle-resolved time-of-flight spectra were recorded. For the adsorbed mol. superoxo species, these measurements show a pronounced translational energy max. at a desorption angle of 60 Deg. Also, this peak is only obsd. at certain azimuthal angles indicating C3v symmetry.
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