Abstract
The interaction of 2500 eV electrons with carbon monoxide chemisorbed on tungsten {100} was investigated by rapid-scan Auger electron spectroscopy. When no α state was present the O and C signals from the β state of CO were invariant during electron bombardment, giving an upper limit estimate for the electron stimulated desorption cross section, Q β of 2 × 10 −21 cm 2. With the crystal at room temperature and saturated with CO, however, electron-beam induced accumulation of carbon was observed and characterised, the rate of the process being independent of CO pressure at pressures above 2 × 10 −8 Torr. At 450 K the rate was found to be pressure dependent up to at least 6 × 10 −7 Torr. A model is proposed for the accumulation process, which is based on electron beam dissociation of α 2-CO to form adsorbed carbon and gaseous O and the creation of new sites for further α 2-CO adsorption; it is in quantitative agreement with the results and yields a cross section for ESD of α 2-CO ( Q α2 = 1.55×10 −18cm 2) in close agreement with direct measurements.
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