Abstract
The kinetics of the uptake of hydrogen and deuterium by ultrahigh-vacuum-evaporated films of manganese were studied in terms of the sticking probability S within the temperature range 78–370 K. For manganese the initial values of S are uniquely low (10 −3–10 −4) compared with other members of the first transition series and are also in contrast because they increase in magnitude with increasing temperature at a given uptake. The maximum uptake at higher temperatures suggests that some absorption occurs. Isosteric measurements of the differential enthalpy of uptake yielded a plateau value of −70 kJ (mol H 2) −1 extending to the limit of composition attained.
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