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Abstract
We report on the determination of cross sections for desorption (σD) of CO/Ni(111) induced by rare-gas ion (He, Ne, Ar and Kr) bombardment at very low impact energy (10–500 eV). When bombarding the initially fully covered surface, mainly neutral CO was desorbed as was measured by the means of a quadrupole mass spectrometer. The desorption cross section was determined from the exponential decay of the signal of desorbed CO. The experiment was simulated with the dynamic Monte Carlo code TRIDYN [W. Möller, W. Eckstein and J.P. Biersack, Comput. Phys. Commun. 51 (1988) 355], and a very good agreement with σD obtained in the experiment was found. By comparing the calculated values of sputtering yields with σD, the role of recoil implantation and dissociation is discussed.
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