Temperature dependence of hydrogen-atom adsorption on molecular-hydrogen surfaces

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Abstract
The temperature dependence of the mean surface dwell time for hydrogen atoms adsorbed on polycrystalline molecular hydrogen surfaces has been measured over the temperature range 3.2 to 4.6 K using magnetic resonance of the hydrogen-atom ground-state hyperfine transition. The mean surface dwell time is reproducible from one surface preparation to another and is exponential with inverse temperature with exponent 39.79(32) K. A detailed theory is presented of the magnetic-resonance signal of a dilute gas subject to perturbations while adsorbed on the surface of its container.