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Abstract The adsorption of helium on an aluminium foil has been measured between 1·8°k and 4·2°k. The principal interest was in the form of an isotherm close to saturation. The maximum thickness observed for the adsorbed layer at the highest saturations (greater than 99·9%) was twenty atomic layers below the λ-point and ten layers above the λ-point. These values for the unsaturated film are compared with existing data for the thickness of the saturated helium II film. The data are also compared with the Frenkel-Halsey-Hill equation for multilayer adsorption and the calculations of Band on the adsorption of a Bose-Einstein gas.
R. Bowers (1953) studied this question.