Abstract
Photodesorption and photodissociation are induced when O 2 adsorbed on Pd(111) is irradiated with UV light. Both processes are non-thermal. In addition thermal desorption of molecular oxygen is observed as a consequence of a displacement process by the nascent atomic oxygen. Angle-resolved time-of-flight spectra were recorded. For the adsorbed molecular superoxo species these measurements show a pronounced maximum in the translational energy at a desorption angle of 60°. Moreover, this peak is only observed at certain azimuthai angles indicating C 3v symmetry.
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