Abstract
It was found that when 4He gas containing water vapor as an impurity condenses on the surface of superfluid He-II cooled to ∼ 1.4 K, semitransparent clouds (icebergs) form in the volume of a glass cell filled with He-II below the He-II surface. The form of the icebergs extracted from the superfluid liquid remains virtually unchanged on heating up to ∼ 1.8 K. In the temperature range 1.8–2.2 K the thermometers register sharp temperature jumps, which are accompanied by jumps in the gas pressure in the cell and a repeated decrease, by more than two orders of magnitude, in the total volume of the condensate, i.e., the water content in the volume of an iceberg does not exceed 1020H2O molecules per 1 cm3. It can be inferred that porous icebergs, permeated with superfluid liquid and containing cores consisting of small clusters surrounded by a layer of solidified helium, form in the volume of He-II as the gas mixture condenses.
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Pis’ma Zh. Éksp. Teor. Fiz. 70, No. 11, 744–748 (10 December 1999)
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Mezhov-Deglin, L.T., Kokotin, A.M. Condensed water in superfluid He-II. Jetp Lett. 70, 756–760 (1999). https://doi.org/10.1134/1.568258
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DOI: https://doi.org/10.1134/1.568258