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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 

 
Title
Adsorption and Desorption of CO on W(110) Surfaces
Author
Taek-seung Yang, Hae-geun Jee, Jin-Hyo Boo, Hyun Seok Han, Gyung Hee Lee, Young Dok Kim*, Soon-Bo Lee*
Keywords
Tungsten, CO, Chemisorption, Photoelectron spectroscopy
Abstract
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.
Page
1115 - 1120
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