Abstract
Temperature programmed desorption (TPD) and static secondary ion mass spectrometry (SSIMS) have been used to study the chemisorption properties of carbon monoxide on potassium-predosed Pt(111). Nonexponential secondary ion yields of potassium containing ions indicate a local interaction between potassium and nearest-neighbor CO molecules. In TPD, two different CO desorption states are observed in the presence of potassium. The high temperature CO TPD state is accompanied by simultaneous potassium desorption. The magnitude of the coincident potassium and CO TPD peak is related to the amount of CO in the high temperature state. Long-range (beyond nearest-neighbor) as well as short-range (nearest-neighbor) potassium effects on adsorbed CO are supported.
Published Version
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