Crystal face specificity of nitrogen adsorption on a platium field emission tip |
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Authors: | BE Nieuwenhuys WMH Sachtler |
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Institution: | Gorlaeus Laboratoria, Rijksuniversiteit, Leiden, The Netherlands |
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Abstract: | The adsorption of nitrogen on platinum is studied with a field emission microscope equipped with a probe-hole assembly to enable quantitative emission measurements on individual crystal faces. The results are implemented by photoelectric measurements on platinum films. Adsorption at 80 K is found to result in a large and face-specific decrease in the work function. On crystal planes containing B5 and B6 sites this decrease is larger than on those exposing B3 and B4 sites only. No significant crystal face specificity is found, however, for the rate of temperature programmed desorption of nitrogen. It follows that the heat of nitrogen adsorption is essentially equal for faces with B3, B4, B5 and B6 sites. This result is at variance with certain postulates in the literature. |
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