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Detailed experimental isotherms are presented for the adsorption of krypton on precipitated silver iodide samples at temperatures between 77.5 and 79.1 K. Analyses of the variation in surface heterogeneity between samples are presented using a new algorithm, HILDA. The results indicate that despite the presence of a number of homotattic areas attributable to different crystal faces, much of the surface represents a wide distribution of adsorption potentials, and hence heterogeneity.The results of isosteric heat determinations on one sample suggest that the Vm values derived from the HILDA analysis are too large, and that despite its theoretical limitations the B.E.T. method yields values of Vm that are more nearly in agreement with isosteric heat curve predictions.

Adsorption potential calculations have been made for the adsorption of water onto ideal (100) and (110) faces of rutile. The results for the (110) face may be interpreted so as to be consistent with the published results of i.r. studies and temperature programmed desorption. The position in relation to the (100) face results remains unresolved. The effects of substituting A13+ and Ti3+ for Ti4+ in the (110) surface plane have been investigated and predict a decrease in the adsorption potential of a water molecule.

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