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The standard theory of the dynamics of superfluid films, although in good qualitative agreement with experiment, is not in perfect quantitative agreement. Until now it has not been clear whether the disagreement is due to inaccuracies in the theory or because the experiments involve an extra...
A method is described for studying thermal phonon scattering in thin films on dielectric substrates below a few Kelvin. It is used to study silica films on silicon substrates. Using Monte Carlo simulations with no free parameters, we find that thermally grown silica films 0.1 to 1.0 μm thick...
We have used the method of fractional distillation to produce an enhanced nuclear polarization of a saturated
He mixture. For the experimental study reported in this paper, we have developed an all plastic distillation setup, which allows high
He circulation rates at low temperatures...
Thin film bolometers are widely used in low temperature experiments. They are always connected in an electrical measuring circuit which involves a current, so an unavoidable Joule heating effect is generated. As a result the detector temperature can be appreciably higher than that of the cell,...
The quantum evaporation experiments of Brown and Wyatt
have been re-analysed in the light of a recent measurement of the high-energy phonon spectrum created by a pulse-heated thin film
. Two sources of systematic error become significant at the level of the precision required by this new...
We have developed a SQUID picovoltmeter and precise temperature control ( ∼μK) to measure sharp R(T) superconducting transitions of low impedance samples, with low current densities. We present measurements obtained on a bulk cylinder of lead (Φ0.25 mm) in transverse magnetic field. A...
Nitrogen has been condensed into Vycor glass and three controlled pore glasses with pore diameters in the nm-range. Adsorption isotherms at 77K have been studied. The induced infrared activity of the N-N stretching vibration has been investigated as function of temperature and filling fraction....
Heat release experiments are reported on quench-condensed thin films of solid H
and HD, measured during the initial annealing. The measurements shed some light on the structural properties of quench-condensed films and particularly allow to estimate the initial grain size. For H
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