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- W1982132610 startingPage "1593" @default.
- W1982132610 abstract "The discrepancy between the force constants for the adsorption of helium found by Bowers at high saturations using the Frenkel isotherm, and Strauss at medium saturations using the Brunauer-Emmet-Teller theory creates some doubts whether or not the amount ${v}_{m}$ derived from the BET isotherm in the saturation range $frac{P}{{P}_{0}}=0.02ensuremath{-}0.2$ represents in the case of helium the amount adsorbed in the first layer. Adsorption measurements at very low saturations show a distinct plateau in the 2ifmmode^circelsetextdegreefi{}K isotherm at $frac{P}{{P}_{0}}ensuremath{sim}{10}^{ensuremath{-}7}$ for ensuremath{sim}0.5 ${mathrm{cm}}^{3}$/${mathrm{m}}^{2}$ adsorbed suggesting the completion of the first layer already at these low saturations. At 4.2ifmmode^circelsetextdegreefi{}K this plateau coalesces with the usual point $B$ of sigmoid isotherms, where $ensuremath{sim}0.8 {mathrm{cm}}^{3}/{mathrm{m}}^{2}={v}_{m}$ is adsorbed.It is therefore proposed to interpret ${v}_{m}$ as the amount adsorbed with $({overline{E}}_{a}ensuremath{-}{E}_{0})>mathrm{RT}$ (${overline{E}}_{a}$ being the differential energy of adsorption, ${E}_{0}$ the energy of vaporization of the bulk liquid), which coincides with the completion of the first layer only for (${E}_{1}ensuremath{-}{E}_{0}$) between about $2RT$ and $8RT$." @default.
- W1982132610 created "2016-06-24" @default.
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- W1982132610 date "1956-09-15" @default.
- W1982132610 modified "2023-09-23" @default.
- W1982132610 title "First Adsorbed Layer of Helium" @default.
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- W1982132610 doi "https://doi.org/10.1103/physrev.103.1593" @default.
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