Abstract
Results obtained by a variety of techniques for the interaction of CO with polycrystalline W ribbons and with the (100) face of a W single crystal are presented and discussed. Desorption spectra from a W ribbon possess three peaks, designated α, β
1
an, β
2
which are kinetically characterized. From electron stimulated desorption (e.s.d.) studies on both W ribbons and W(100) it is concluded that the α desorption peak is a composite from two states, α
1
and α
2
which yield, respectively, CO
+
and O
+
; the ionic e.s.d. cross-section for the β states is negligible by comparison with that for the α states. An interconversion from α
1
to α
2
, occurring during both thermal and electronic depopulation of the α
1
state, is quantitatively characterized. Reflexion-absorption infrared spectroscopy reveals a band at
ca
. 211000 m
-1
for CO on polycrystalline W, and this is shown to be associated with the carbon-oxygen vibration in the α states. Oxygen is rapidly adsorbed by a CO-saturated W surface, with a preferential depletion of α
1
-CO. The β-CO states are not depleted by O
2
, but undergo (
a
) complete isotopic mixing with coadsorbed oxygen, and (
b
) convergence into a single monotonic desorption peak appearing at the β
1
peak position. The results are consistent with dissociative adsorption in the β states.
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