Abstract
From the analysis of a set of stepped adsorption isotherms of krypton on the cleavage face of calcium iodide, it is concluded that, above 70.5 K, a second adsorbed monolayer is formed, having an apparent molar energy (algebraic value) and entropy higher than those of the bulk phase of the adsorbate. The differences in energy and entropy are exceptionally high for a second layer, and consequently, when the temperature is lowered below 70.5 K, the pressure corresponding to the second step becomes higher than the sublimation pressure and the step disappears. This unusual observation of a second dense monolayer existing only because of its high entropy, again emphasizes the fundamental importance of entropy in physical adsorption. It is secondarily noted that the isotherms present evidence of interparticle condensation occurring at high relative pressures.
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