Heat capacity of solid carbon tetrachloride from 3 to 50 K

The heat capacity of solid carbon tetrachloride was measured between 3 and 50 K. The results compare favorably with previous measurements above 20 K. The standard entropy for the gas was revised to (74.2 ± 0.3) cal K −3 mol −1 in comparison with the spectroscopic entropy of 74.03 cal K −1 mol −1 at...

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Bibliographic Details
Published in:The Journal of chemical thermodynamics 1971, Vol.3 (1), p.51-60
Main Authors: Atake, Tooru, Chihara, Hideaki
Format: Article
Language:English
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Summary:The heat capacity of solid carbon tetrachloride was measured between 3 and 50 K. The results compare favorably with previous measurements above 20 K. The standard entropy for the gas was revised to (74.2 ± 0.3) cal K −3 mol −1 in comparison with the spectroscopic entropy of 74.03 cal K −1 mol −1 at 25°C. From the analysis of low temperature heat capacities, the Debye temperature at 0 K was derived as (100.3 ± 2.7) K. The average molecular librational wavenumber in the Einstein approximation was 40 cm −1 in agreement with the predictions from other experiments. However, it is suggested that the librational spectrum has a distribution of frequencies towards lower frequencies. Approximate values of the positive moments of the frequency spectrum were estimated.
ISSN:0021-9614
1096-3626
DOI:10.1016/S0021-9614(71)80066-6