Simultaneous SIMS and EID investigation on the interaction of oxygen with a W (100) surface |
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Authors: | A Benninghoven E Loebach C Plog N Treitz |
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Institution: | I. Physikalisches Institut, Universität Köln, 5 Köln 41, Universitätsstr, 14, Germany |
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Abstract: | A UHV system, containing a beatable tungsten ribbon target (showing 100] planes), an ion source (Ar+, 2 keV) with mass separator, an electron source (300 eV), a quadrupole secondary ion mass filter, and a quadrupole gas analyzer is used for the study of the interaction of O2 with W (100) by simultaneous, i.e. fast interchanging, “static” SIMS (secondary ion-induced] ion mass spectrometry) and EID (electron-induced ion] desorption). Two different adsorptive binding states can be distinguished: β2 and β1. The O+ emission cross section under electron bombardment from the β2 state is smaller by a factor of about 103 than from β1 and is found to be temperature-dependent. After the state β2 has been saturated and before the occupation of β1 begins, an oxide formation process starts. This oxidation can be interpreted by a two-stage model. |
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