Abstract
The thermodynamic functions of molecules of type XF 6 are calculated under an exact quantummechanical approach, which also yields general expressions valid for other types of molecules. The formalism is used to analyze the behaviour of gaseous UF 6 at very low temperatures (around and below 1°K), where symmetry effects caused by the Pauli principle lead to results which are very markedly different from those obtained from a semi-classical approximation. It is shown that this approximation becomes sufficiently accurate only for temperatures about ten times the rotational temperature.
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