The Temperature Variation of the Thermal Diffusion Factors for Binary Mixtures of Hydrogen, Deuterium, and Helium

Experimental values of the thermal diffusion factor,

α

, have been measured by the twin bulb method for mixtures of

H_{2}

and

D_{2}

H_{2}

and He, and

D_{2}

and He. Analyses were made by means of a mass spectrometer. The value of

α

for a mixture of

H_{2}

and

D_{2}

was found to increase slightly with temperature. For a mixture of

H_{2}

and He the value of

α

was found to decrease slightly as the temperature is raised. The thermal diffusion factor was found to be measurable for a mixture of

D_{2}

and He and also appeared to decrease with temperature.

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