Inner valence levels as a structural probe For chemisorbed molecules: O2 on Pt(111)
✍ Scribed by W. Eberhardt; T. Upton; S. Cramm; L. Incoccia
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 403 KB
- Volume
- 146
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
We have measured the electronic structure of O2 chemisorbed in a x-bonded configuration on Pt ( 111) at 100 K. The positions of the inner valence levels of the adsorbate are extremely sensitive to the molecular adsorbate bond length. Comparing the measured binding energies of the three innermost o-valence orbitak with calculations for the free O2 molecule, we deduce a bond length of 1.40f0.04 8, for the chemisorbed 02 species. This is substantially larger than the internuclear distance in the free molecule ( 1.2 1 A). This study establishes that inner valence photoemission can be used to quantitatively determine the bond lengths for molecular adsorbates.