Abstract
Dynamic gas-diffusion techniques have been developed for measuring the binding energy for adsorption which are effective even when adsorbents of only small surface area are available. The first technique, first developed by Pollock et al., measures the diffusion time for a pulse of gas to pass in “molecular” flow through a narrow channel, the walls of which are composed of the adsorbent of interest, as a function of temperature. The second technique measures the changes of molecular flow rate out of such a channel when the temperature of the channel is abruptly altered by small increments. Both techniques yield the binding energy for adsorption and the results obtained with them for adsorption of 3He and 4He at low temperatures on copper, gold, and Grafoil surfaces are presented. It is found that the results are in good agreement with data obtained previously by conventional static methods which require much larger adsorbent surface areas.
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