Abstract
An improved technique of calorimetric measurements on evaporated metal films is described and results of measurements of heats of hydrogen sorption on molybdenum films at 20°C are presented. The initial heat of hydrogen adsorption on molybdenum is 40 kcal mole−1, and integral heat of adsorption (for surface coverage up to ϑ = 0.9) is 31 kcal mole−1. Molybdenum ranks between tungsten and iron as regards the value of the heat of hydrogen adsorption and the dependence of the heat on surface coverage. A partial coverage of the molybdenum surface by oxygen leads to a very slight increase of the heat of the following hydrogen sorption (by several per cent). A dependence of this increase on the extent of oxygen preadsorption was not found. No signs of a reaction of preadsorbed oxygen with hydrogen were detected calorimetrically.
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