Oxygen photochemistry on Pt(111)

Ian A. Harrison; Vladimir A. Ukraintsev; Alexander N. Artsyukhovich

doi:10.1117/12.180853

21 July 1994 Oxygen photochemistry on Pt(111)

Ian A. Harrison, Vladimir A. Ukraintsev, Alexander N. Artsyukhovich

Proceedings Volume 2125, Laser Techniques for Surface Science; (1994) https://doi.org/10.1117/12.180853
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

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.

Citation Download Citation

Ian A. Harrison, Vladimir A. Ukraintsev, and Alexander N. Artsyukhovich "Oxygen photochemistry on Pt(111)", Proc. SPIE 2125, Laser Techniques for Surface Science, (21 July 1994); https://doi.org/10.1117/12.180853

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