Abstract
Desorption cross-sections are reported for low-energy hydrogen ion impact on sulfur covered stainless steel surfaces. Using secondary ion mass spectrometry, the production rate of S − was observed to decrease exponentially as a function of hydrogen ion fluence and provided a reliable means for determining desorption cross-sections in the absence of residual gas adsorption. The cross-section for sulfur desorption by hydrogen increased slightly as the incident ion energy decreased from 1.5 to 0.3 keV/atom. Similar results were obtained when H 2 + or H 3 + ion species were used in place of H +. Impurity release in fusion devices from hydrogen ion impact is discussed briefly.
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