The deuteron fast Fourier transform (FFT) spectra of the ring deuterated nematogens para‐azoxyanisole (PAA‐d8) and p‐methoxybenzylidene pn‐butylaniline (MBBA‐d8) have been studied as a function of temperature. An interpretation of the spectra is presented. It is based on the assumption of nonequivalent deuterons, a twist angle φ between the planes of the benzene rings, and an asymmetry order parameter δ in addition to the usual nematic order parameter S. The temperature dependences of δ and φ have been obtained.

1.
J. C.
Rowell
,
W. D.
Phillips
,
L. R.
Melby
, and
M.
Panar
,
J. Chem. Phys.
43
,
3442
(
1965
).
2.
Z.
Luz
,
R. C.
Hewitt
, and
S.
Meiboom
,
J. Chem. Phys.
61
,
1758
(
1974
).
3.
J. J.
Visintainer
,
E.
Bock
,
R. Y.
Dong
, and
E.
Tomchuk
,
Can. J. Phys.
53
,
1483
(
1975
).
4.
P.
Diehl
and
A. S.
Tracey
,
Mol. Phys.
30
,
1917
(
1975
).
5.
A.
Lösche
,
Ann. Phys. (Leipzig)
31
,
182
(
1974
).
6.
N.
Bravo
,
J. W.
Doane
,
S. L.
Arora
, and
J. L.
Fergason
,
J. Chem. Phys.
50
,
1398
(
1969
).
7.
Y. S. Lee, Y. Y. Hsu, and D. Dolphin, Liquid Crystals and Ordered Fluids, Vol. 2, edited by J. F. Johnson and R. S. Porter (Plenum, New York, 1974), p. 357.
8.
J. S.
Prasad
,
J. Chem. Phys.
65
,
941
(
1976
).
9.
R.
Alben
,
J. R.
McColl
, and
C. S.
Shih
,
Solid State Commun.
11
,
1081
(
1972
).
10.
Z.
Luz
and
S.
Meiboom
,
J. Chem. Phys.
59
,
275
(
1973
).
11.
I. Y.
Wei
and
B. M.
Fung
,
J. Chem. Phys.
52
,
4917
(
1970
).
12.
D. M.
Ellis
and
J. L.
Bjorkstam
,
J. Chem. Phys.
46
,
4460
(
1967
).
13.
W. R.
Krigbaum
,
Y.
Chatani
and
P. G.
Barber
,
Acta Crystallogr. Sec. B
26
,
97
(
1970
).
14.
R.
Chang
,
Mol. Cryst. Liq. Cryst.
36
,
155
(
1975
).
15.
S. K.
Ghosh
,
Solid State Commun.
11
,
1763
(
1972
).
16.
A. Abragam, The Principles of Nuclear Magnetism (Oxford University, London, 1961).
17.
M. E. Rose, Elementary Theory of Angular Momentum (Wiley, New York, 1957).
18.
S. G.
Carr
,
S. K.
Khoo
,
G. R.
Luckhurst
, and
C.
Zannoni
,
Mol. Cryst. Liq. Cryst.
35
,
7
(
1976
).
This content is only available via PDF.
You do not currently have access to this content.