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

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

2007-06-27

arxiv.org/abs/0706.4092v1

Ricardo E. Avila, Jap. J. Appl. Phys. 45, 9254 (2006)

Physics

Condensed Matter

Other Condensed Matter

5 pages, 3 figures. Published as Ricardo E. Avila, Jap. J. Appl. Phys. 45, 9254 (2006)

Scientific paper

10.1143/JJAP.45.9254

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

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