Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low temperature anomaly of heat capacity of CD4 rotors in solid CD4-Kr
  solution   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.

2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int