We have calculated the rate of para- to ortho-hydrogen conversion when the transition occurs in a physically-adsorbed-gas surface layer above a magnetic substrate. The conversion rates for surfaces with dilute, random, paramagnetic surface sites and for surfaces with a regular lattice of magnetic sites are considered separately. Absolute rates in terms of physical parameters are obtained for a variety of different physical situations.
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Petzinger et al. (1973) studied this question.
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