  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.
