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The release of a gas limited by surface desorption, or by diffusion from thebulk of spherical pebbles is revisited. A method is proposed to identify therelease limiting process, by comparing a partial temperature ramp, up toslightly beyond the release peak, followed by a rapid temperature drop, to asecond, full release ramp. Comparing the release curve from the second ramp tothat of the first one: i) the peak is unmoved in first order desorptionkinetics, and moves to higher temperature in the other cases, ii) as comparedto the Arrhenius analysis of the first curve, that of the second is, again,identical in first order kinetics, in second order desorption it maintains theslope but lowers the intercept at the reciprocal temperature origin, and it isinapplicable in bulk diffusion kinetics.

Distinguishing Bulk-Diffusion from Surface-Desorption Limited Gas Release Processes