Helium desorption measurements with a Mo-crystal show (a) that during stage III annealing vacancies are removed but that (b) vacancies containing helium (HeV), which are immobile, are not affected. Since interstitials injected at room temperature do recombine with HeV's, it seems that, in stage III, vacancies become mobile and interstitials remain trapped (in e.g. clusters). These observations are supported by atomistic calculations. Measured desorption energies of helium from vacancies in Mo show good agreement with the calculated energies.
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Caspers et al. (1976) studied this question.
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