LASER-INDUCED O-2 DESORPTION FROM TIO2 SURFACES

Laser-induced oxygen molecule desorption from crystalline (110)and com pressed-powder rutile TiO2 surfaces is investigated by time-of-flight distributions and desorption signal dependencies oil laser fluence. A double-component distribution of desorbed O-2 molecules (a fast one an d a slow one) justifies validity of both photoelectronic and thermo-ac tivation mechanisms. The defected surfaces characterized by the more i ntensive oxygen escape supporting the desorption flow formation via th e surface defect sites. (C) 1998 Elsevier Science B.V.