Low temperature anomaly of heat capacity of CD4 rotors in solid CD4-Kr solution

Details Low temperature anomaly of heat capacity of CD4 rotors in solid CD4-Kr solution Low temperature anomaly of heat capacity of CD4 rotors in solid CD4-Kr solution

2004-12-06

arxiv.org/abs/cond-mat/0412134v1

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1007/s10909-005-5442-6

The heat capacity of the solid Kr-CD4 (13% CD4) solution has been investigated. It is shown that the temperature dependence of the heat capacity Crot of the rotational subsystem in this solution is radically different from the corresponding dependences in the previously studied Kr-CD4 (1%, 5% CD4) and Kr-CH4 (5-60%) solutions. A model is proposed to explain the observed dependence Crot(T). The experimental results can be described taking into account the contribution to the heat capacity from CD4 molecules that are in weak, medium and strong molecular fields. The mean concentrations and energy differences between the ground and first excited energy levels of the CD4 molecules in these molecular fields have been estimated.

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