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Thermal Diffusion with Ammonia
Phys. Rev. 63, 181 – Published 1 March, 1943
DOI: https://doi.org/10.1103/PhysRev.63.181
Abstract
With a "two-bulb" thermal diffusion experiment in which is used N having about a 15 percent content to increase the accuracy of the mass spectrometer analyses, it has been found that with decreasing temperature the thermal diffusion constant of ammonia changes from + to - values at about room temperature. The value of varies linearly with the logarithm of the absolute temperature, the rate of decrease being, however, nearly eight times that for neon and argon. A qualitative discussion is presented, attributing this effect largely to the strong first-order dipole-dipole intermolecular forces which are proportional to .
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