Abstract
The removal of adsorbed deuterium from stainless steel by energetic molecular hydrogen ions (H 2 + and H 3 +) has been studied with secondary ion mass spectrometry. Desorption cross sections for this process range from 1.2 × 10 −16 cm 2 to 5 × 10 −17 cm 2 for incident ion energies 0.3 to 1.5 keV/atom. The cross sections increase as the incident ion energy is lowered. At low energies, direct interactions between incident particles and adsorbate atoms appear to be important in causing desorption. Dissociation of molecular hydrogen ions occurs prior to desorption. The implications of these findings with respect to the mechanisms for ion impact desorption and to fuel recycling phenomena in tokamaks are discussed.
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