The technique of holographic interferometry is applied to the study of diffusion in transparent liquid mixtures. A simple method is derived for determining the diffusion coefficient from measurements of the location and the time evolution of fringes on a double exposed hologram. Results on sucrose solution are presented and compared with other methods.
The specific heats of solid neon and xenon have been measured in the temperature range 1.5 to 24°K, using a calorimeter with a mechanical heat switch. Carbon resistance thermometers were calibrated against a gas thermometer and the helium vapor-pressure scale. The results were analyzed to obtain the temperature dependence of the Debye temperature, в с (Г). In the range 0.020<Г/в 0 с <0.505, the data were fitted with an expression of the form В с (Т)=во с +АТ 2 ,where G 0 C is the Debye temperature at 0°K. This procedure gave 0 o c =74.6dbl.O°K for neon and е 0 с = 64.0±0.8°К for xenon. The results for в с (Т) are compared with the calculations of Bernardes, Horton, and Leech, and Barron and Klein, based on Mie-Lennard-Jones potentials for the interaction energy between two atoms. Tables of the following smoothed thermodynamic properties between 1.0 and 24°K are given in Table I: specific heat at constant pressure, specific heat at constant volume, entropy, and enthalpy.
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