Abstract
We present energy distributions of secondary electrons emitted from polycrystalline clean and oxygen covered tungsten due to impact of slow singly and doubly charged noble gas ions (15 eV). To discuss the influence of surface contamination on the various ion neutralization and de-excitation processes and the resulting measured ejected-electron energy distributions, our experimental results have been compared with electron spectra as computed with the semi-empirical theory of Hagstrum. With oxygen adsorbed at the tungsten surface a drastic change of the electron density of states distribution occurs, which has been included in our calculations by modifying the state density distribution with increasing target contamination as found from UPS measurements.
Published Version
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