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Adsorption and Dissociation of CO on Tungsten Surface Studied by Field-Emission Microscopy

Kiyoshi Senzaki, Koji Kawasaki

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Abstract

The adsorption and desorption of CO for tungsten have been studied by a field-emission microscope with a steady-state or pulsed field to make clear the location dependency of binding states of CO adsorbed on tungsten surface, i.e. , one weakly held α state and three more strongly held β states which are distinguished by flash desorption measurements. CO in the α state is found on all the planes of tungsten, whereas the β states depend on the surface structure. From the field-emission microscopic observation of the adsorption of CO in tungsten above 600°C, there seems to be some possibility of dissociation of CO on hot tungsten.

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What this paper is about

The adsorption and desorption of CO for tungsten have been studied by a field-emission microscope with a steady-state or pulsed field to make clear the location dependency of binding states of CO adsorbed on tungsten surface, i.e. , one weakly held α state and three more strongly held β states which are distinguished by flash desorption measurements. CO in the α state is found on all the planes of tungsten, whereas the β states depend on the surface structure. From the field-emission microscopic observation of the adsorption of CO in tungsten above 600°C, there seems to be some possibility of dissociation of CO on hot tungsten.

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Available abstract

The adsorption and desorption of CO for tungsten have been studied by a field-emission microscope with a steady-state or pulsed field to make clear the location dependency of binding states of CO adsorbed on tungsten surface, i.e. , one weakly held α state and three more strongly held β states which are distinguished by flash desorption measurements. CO in the α state is found on all the planes of tungsten, whereas the β states depend on the surface structure. From the field-emission microscopic observation of the adsorption of CO in tungsten above 600°C, there seems to be some possibility of dissociation of CO on hot tungsten.

Key concepts: Tungsten, Adsorption, Field electron emission, Dissociation (chemistry), Desorption, Field emission microscopy, Field ion microscope, Chemistry

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