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Resonance electron scattering by physisorbed and chemisorbed O2 on Pt(111)

✍ Scribed by L. Šiller; J.F. Wendelken; K.M. Hock; R.E. Palmer

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
526 KB
Volume
210
Category
Article
ISSN
0009-2614

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✦ Synopsis

We have investigated resonance electron scattering by both physisorbed and chemisorbed molecular O2 on Pt( 111). In each case, the molecular &-shape resonance is manifest in the vibrational excitation cross section but the resonance energy is lowered in comparison with the free molecule. We attribute the shift in energy (2.25 eV) in the physisorbed molecule primarily to an image potential effect. We identify the increased bond length of the chemisorbed molecule as an important factor in the larger shift (5.75 eV) observed in this case. This conclusion is supported by a consideration of data for adsorbed molecules containing the CO group.

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