Temperature induced effects in the coadsorption system: CO/D2/Ni(100) |
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Authors: | DE Peebles HC Peebles DN Belton JM White |
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Institution: | Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, USA |
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Abstract: | The temperature dependent changes in the CO/D/Ni(100) system have been examined using thermal desorption spectroscopy, work function change measurements, ultra-violet photoelectron spectroscopy and X-ray photoelectron spectroscopy. Three forms of CO(a) have been found, one of which exists only in the intermediate temperature range of 130–215 K. This form is believed to be a CO(a) tilted with respect to the surface normal, with significant ONi interaction. In addition, a new interpretation of several UPS parameters measured for CO(a) is presented. It is proposed that for CO(a), the 5σ?1π separation is a probe of bonding geometry, the 4σ?1π separation reflects COCO repulsion, and the intensity ratio reflects the NiCO bond strength. |
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