Abstract
The release of He, Ar, and Xe, ionically pumped into Pyrex glass surfaces, is studied as a function of time after the cessation of pumping. Both pumping and release are conducted at room temperature. The parameters of pumping pressure and pumping time are varied in a dynamic system so that the pressure during pumping is maintained constant. A general release-rate function of the form Rate proportional to Time raised to the —m is obtained, the index m depending upon the pumping time, pressure, and gas species; and the results are interpreted in terms of release of gas from capture sites in the glass that possess a spectrum of activation energies for desorption.
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