title: The study of oxygen molecules on Pt (111) surface with high resolution x-ray photoemission spectroscopy.
abstract: By using high resolution x-ray photoelectron spectroscopy, we show that inelastic scattering of photoelectron at low temperature (30-50 K) 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 the surface. Estimated coverage of dissociated atomic oxygen is 0.5 ML, suggesting possible formation of p(2 x 1) surface structure, while PtO coverage shows saturation coverage of 0.5 ML. Molecular oxygen dosed at 30 K undergoes thermally activated transition from physisorbed to chemisorbed state at around 40 K.
authors.affiliation: Department of Applied Physics, ERICA, Hanyang University, Gyeonggi 426-791, Korea.
authors.forename: Yong Su
authors.initials: YS
authors.lastname: Kim
authors.forename: Aaron
authors.initials: A
authors.lastname: Bostwick
authors.forename: Eli
authors.initials: E
authors.lastname: Rotenberg
authors.forename: Philip N
authors.initials: PN
authors.lastname: Ross
authors.forename: Soon Cheol
authors.initials: SC
authors.lastname: Hong
authors.forename: Bongjin Simon
authors.initials: BS
authors.lastname: Mun