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Layer-by-layer growth of 4He adsorbed on one-dimensional 18 angstrom -pores

We have measured vapor pressures (P) of 4He adsorbed on one-dimensional pores of 18 angstrom diameter with a sensitivity of 2 x 10-3 mbar as a function of coverage down to 1.2 K. The isothermal compressibility (KT) calculated from P isotherm has two minima, which are associated with the completion o... Full description

Published: New York, Kluwer Academic/Plenum Publishers, 2000
Kongresse: International Symposium on Quantum Fluids and Solids 2000 2000.06.06-2000.06.11 Minneapolis, MN, US
QFS 2000 2000.06.06-2000.06.11 Minneapolis, MN, US
International Symposium on Quantum Fluids and Solids 2000.06.06-2000.06.11 Minneapolis, MN, US
QFS 2000 2000.06.06-2000.06.11 Minneapolis, MN, US
Contained in: Journal of Low Temperature Physics Vol. 121, No. 5-6 (2000), p. 537-542
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ISSN: 0022-2291
Additional Keywords: ADSORPTION
ADSORPTIONSENERGIE
DAMPFDRUCK:MECHANIK
FLUESSIGHELIUM
KOMPRESSIBILITAET
LATENTE-WAERME
PORENGROESSE
SCHICHTWACHSTUM
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 6 Seiten, 9 Quellen
PPN (Catalogue-ID): WTI038053896
Note: WTI TEMA DB
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520 |a We have measured vapor pressures (P) of 4He adsorbed on one-dimensional pores of 18 angstrom diameter with a sensitivity of 2 x 10-3 mbar as a function of coverage down to 1.2 K. The isothermal compressibility (KT) calculated from P isotherm has two minima, which are associated with the completion of the first and the second layer. The adsorption energy was obtained quantitatively from an Arrhenius type temperature dependence of P. As the coverage is increased, the adsorption energy at T = 0 per atom (Delta0/kB) decreases from 180 K to 35 K, followed by a clear step associated with a second layer promotion. After second layer completion, Delta0/kB is constant. The magnitude is the same value as the latent heat of the bulk 4He liquid (gamma K). These results give us a clear picture that 4He film grows in a layer-by-layer fashion up to the second layer on one-dimensional pore walls. 
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