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The study of oxygen molecules on Pt (111) surface with high resolution x-ray photoemission spectroscopy

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제 39 회 하계학술대회 초록집 61 S2-003

The study of oxygen molecules on Pt (111) surface with high resolution x-ray

photoemission spectroscopy

Yong Su Kim1,2, Aaron Bostwick2, Eli Rotenberg2, Philip N Ross3, Soon Cheol Hong4, Bongjin Simon Mun1,2

1Department of Applied Physics, Hanyang University, ERICA, Gyeonggi 426-791, Korea,

2Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA,

3Materials and Molecular Research Division, Lawrence Berkeley National Labo

By using high resolution x-ray photoelectron spectroscopy, we show that inelastic scattering of photoelectron at low temperature (30K∼50K) generates two kinds of oxygen species on Pt (111) surface. Intense synchrotron radiation source dissociates oxygen molecules into chemisorbed atomic oxygen and induces the formation of PtO on surface. Estimated coverage of dissociated atomic oxy- gen is 0.5 ML, suggesting possible formation of p(2×1) surface structure, while PtO coverage shows saturation coverage of 0.5 ML. Molecular oxygen dosed at 30 K undergoes thermally activated tran- sition from physisorbed to chemisorbed state at around 40K.

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