|dc.description.abstract||A general correlation function is firstly reviewed in line
with Kubo's formulation (Chap. 1, (a)), and dielectric relaxation
processes together with some fundamental properties are
considered with the help of the function (Chap. 1, (b)). The
Introduction of Hoffmann's site model enables us to calculate a
dielectric correlation function. This technique is applied to
the dielectric relaxation of some molecules, (Chap. 1 (c)).
Discussion with respect to the calculation of the molecular
dipole moment for a molecule which contains two equivalent
rotational groups is made (Chap. 2, (a)). The results are applied
to two convenient models, i.e., a free rotation model and a model
called "free oscillation" which is proposed in this thesis. The
latter model is employed for the cases of o-haloanisole and
Experimental dielectric constant and loss data were analyzed
by the Cole-Cole equation as well as Budo's equation (Chap. 3).
Rotation of the methoxy group in dimethoxy compounds was
examined by relaxation time and dipole moment. The mean relaxation
time for o-dimethoxybenzene is found to be short. (Chap. 4).
The variation of the relaxation time of the methoxy group
of anisole is considered theoretically (Chap. 4, (c)).
Mesomeric and double internal rotation mechanisms concerning
the anomalously short relaxation time of diphenyl ether are
discussed. Correlation function treatments are made based on the former mechanism.( Chap. 5).
Rotation around S-S bonds is concluded to be restrictive.
(Chap. 6). Relaxation time and dipole moment values of difuryl
mercury are explained in terms of the non-linearity of C-Hg-C
bond. (Chap. 7).||