The 308 nm laser induced photodesorption of physisorbed and chemisorbed O2 on Pt(111) has been examined. Photodesorption of physisorbed O2 occurred with 9 X 10-20 cm2 cross section, and exhibited a sharp approximately cos34$ angular distribution and a structured O2 translational energy distribution, P(delta )(E(Tau )), which extended to E(Tau )equals1.2 eV. In contrast, photodesorption of chemisorbed O2 occurred with 1.8 X 10-20 cm(superscript 2 cross section, and exhibited a broad approximately cos$ angular distribution and a O2P(delta )(E(Tau )) which extended to only E(Tau )equals0.8 eV. Photodesorption mechanisms involving photoexcitation of substrate electrons are discussed.
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