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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 6
BKCSDE 29(6)
June 20, 2008 

Adsorption and Desorption of CO on W(110) Surfaces
Taek-seung Yang, Hae-geun Jee, Jin-Hyo Boo, Hyun Seok Han, Gyung Hee Lee, Young Dok Kim*, Soon-Bo Lee*
Tungsten, CO, Chemisorption, Photoelectron spectroscopy
The adsorption of CO on W(110) surfaces was studied using thermal desorption spectroscopy (TDS), and core and valence level spectroscopy. At 120 K, CO forms a tilted structure at lower coverages (α1), whereas it adsorbs normal to the surface at higher coverages (α2). Tilted structures have been suggested to be precursors of dissociative chemisorption; however, experimental evidence is provided for the non-dissociative chemisorption of CO at temperatures above 900 K (which is referred to as the β-state): TDS shows first order desorption kinetics. The core and valence level spectra of O/W(110) and those of β-CO/W(110) are different. Most importantly, the 4σ molecular orbital of CO can be identified in the valence level spectra of the β-CO.
1115 - 1120
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