Empirical Relation between the Adsorption Properties on Gold Surfaces and Volatility of the Elements
نویسنده
چکیده
The typical result of gas phase chemical investigations on a one-atom-at-a-time level are standard adsorption enthalpies (∆Hads) of chemical species on stationary chromatographic surfaces. The standard adsorption enthalpies are deduced from experimental results using either the model of linear gas chromatography assuming mobile adsorption [1] or Monte-Carlo based models [2]. The obtained enthalpy values are independent on experimental conditions. The absolute amounts of these enthalpies represent the strength of interaction of the species with the surface. For example the deposition temperatures represent a comparable measure for this interaction strength only in the case of comparable experimental conditions. Thermochemical data describe collective properties of macroscopic amounts of the chemical species. Hence, links are needed for the derivation of thermochemical data from the experiments with single atoms. Nowadays, the only links are empirical correlations between ∆Hads and collective data related to evaporation or sublimation as boiling points (b.p.) or standard sublimation enthalpies (∆Hsubl) of the type (eqn. 1):
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