Reflection-absorption infrared spectrum of α-CO chemisorbed on polycrystalline tungsten
The infrared spectrum of chemisorbed α-CO on polycrystalline tungsten has been studied using ultrahigh vacuum techniques. The α-CO state has been spectroscopically resolved into two states, designated α 1-CO (wavenumber ∼2128 cm −1) and α 2-CO (wavenumber ∼2090 cm −1). α 2-CO adsorbs predominantly i...
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Veröffentlicht in: | Surface science 1973-01, Vol.36 (2), p.739-755 |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The infrared spectrum of chemisorbed α-CO on polycrystalline tungsten has been studied using ultrahigh vacuum techniques. The α-CO state has been spectroscopically resolved into two states, designated α
1-CO (wavenumber ∼2128 cm
−1) and α
2-CO (wavenumber ∼2090 cm
−1). α
2-CO adsorbs predominantly in the first stages of α-CO adsorption; α
1-CO forms primarily at high α-CO coverages at the partial expense of α
2-CO. α
1-CO is found to desorb at a slightly lower temperature than α
2-CO. Both α-CO states are postulated to involve sp-hybridized carbon which is bonded to the tungsten surface. These states have previously been detected in electron impact desorption measurements, where α
1-CO was shown to liberate CO
+ and α
2-CO to liberate O
+. |
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ISSN: | 0039-6028 1879-2758 |
DOI: | 10.1016/0039-6028(73)90416-0 |