Thin films of3 He ? Implications on the identification of3 He ?A
نویسندگان
چکیده
منابع مشابه
On the Structure of Thin 4 He Films on Solid Hydrogen
We have investigated the adsorption of 4He onto a quench-condensed H2 film by means of surface state electrons. Oscillations in the surface state electron conductivity clearly reveal the layerwise character of the adsorption. At temperatures below 2K we have observed an anomaly in the conductivity around the completion of the first monolayer. This new feature is interpreted as an indication of ...
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(Dated: February 1, 2008) A normal-fluid component varying as T is observed at very low temperatures in superfluid He and He-He mixture films adsorbed in alumina powder. The normal fluid appears to arise from thermally excited third sound that has one-dimensional propagation characteristics. A Landau model of third sound excitations in an infinite cylindrical pore by Saam and Cole provides good...
متن کاملX - ray - induced thinning of 3 He and 3 He Õ 4 He mixture films
Films of isotopic mixtures of helium have been studied using x-ray specular reflectivity techniques. In contrast with superfluid He films, x-ray exposure causes a reduction in the thickness of He films above the superfluid transition as well as films of pure He and He/He mixtures. One proposed model that could account for this effect is a charging model, in which thinning is caused by electrost...
متن کاملPath Integral Monte Carlo Simulations of Thin 4 He Films on a H 2 Surface
Atomically thin 4 He lms of up to three monolayers on molecular hydrogen (1,1,1) surfaces are studied at T=0.5 K, using path integral Monte Carlo. We compute the binding energy of 4 He to the H 2 substrate as a function of 4 He coverage and obtain evidence of the prewetting transition. Density pro les perpendicular to the 4 He-H 2 interface are obtained, as well as the zero point motion and e e...
متن کاملEffect of 3 He on Third Sound Attenuation in Thick 4 He Films
We have performed measurements of third sound attenuation in thick films of superfluid He in the presence of small amounts of He. The attenuation due to He appears to depend linearly on the number density of He atoms in the film. We discuss the results in context of a recently proposed mechanism where the attenuation is caused by the interaction of the excitations in helium with the trapped vor...
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ژورنال
عنوان ژورنال: Journal of Low Temperature Physics
سال: 1994
ISSN: 0022-2291,1573-7357
DOI: 10.1007/bf00755414