Relaxation processes in polymethylmethacrylate were investigated using light scattering and mechanical relaxation techniques. The acoustic attenuation data cover the frequency range from 1 Hz to 17 GHz and the light scattering from 0.5 to 10 000 GHz. Analysis of the data in a broad temperature range (80–350 K) shows that the model of the asymmetric double-well potentials, traditionally used for description of the acoustic attenuation in glasses, cannot describe all the data consistently. It is shown that assuming an additional relaxation in GHz region with a constant loss spectrum provides a good agreement of the model with experimental data.

1.
N. V.
Surovtsev
,
J.
Wiedersich
,
V. N.
Novikov
,
A. P.
Sokolov
, and
E.
Rössler
,
Phys. Rev. B
458
,
14888
(
1998
).
2.
K. S.
Gilroy
and
W. A.
Phillips
,
Philos. Mag. B
43
,
735
(
1981
).
3.
N.
Theodorakopoulos
and
J.
Jäckle
,
Phys. Rev. B
14
,
2637
(
1976
).
4.
A. P.
Sokolov
,
V. N.
Novikov
, and
B.
Strube
,
Europhys. Lett.
38
,
49
(
1997
).
5.
J. Jäckle, in Amorphous Solids: Low-Temperature Properties, edited by W. A. Phillips (Springer, Berlin, 1981).
6.
D.
Tielbürger
,
R.
Merz
,
R.
Ehrenfels
, and
S.
Hunklinger
,
Phys. Rev. B
45
,
2750
(
1992
).
7.
K. A.
Topp
and
D. G.
Cahill
,
Z. Phys. B: Condens. Matter
101
,
235
(
1996
).
8.
R.
Keil
,
G.
Kasper
, and
S.
Hunklinger
,
J. Non-Cryst. Solids
164–166
,
1183
(
1993
).
9.
J.
Wiedersich
,
N. V.
Surovtsev
,
T.
Blochowicz
,
C.
Tschirwitz
,
A.
Kudlik
,
V. N.
Novikov
,
D.
Quitmann
, and
E.
Rössler
,
J. Phys.: Condens. Matter.
11
,
A147
(
1999
).
10.
N. V.
Surovtsev
,
J. A. H.
Wiedersich
,
E.
Duval
,
V. N.
Novikov
,
E.
Rössler
, and
A. P.
Sokolov
,
J. Chem. Phys.
112
,
2319
(
2000
).
11.
J.
Gapinsky
,
W.
Steffen
,
A.
Patkowsky
,
A. P.
Sokolov
,
A.
Kisliuk
,
U.
Buchenau
,
M.
Russina
,
F.
Mezei
, and
H.
Shober
,
J. Chem. Phys.
110
,
2312
(
1999
).
12.
J. R.
Sandercock
,
Top. Appl. Phys.
51
,
173
(
1982
);
S. M.
Lindsay
,
M. W.
Anderson
, and
J. R.
Sandercock
,
Top. Appl. Phys.
52
,
1478
(
1981
).
13.
C.
Masciovecchio
,
G.
Monako
,
G.
Ruocco
,
F.
Sette
,
A.
Cunsolo
,
M.
Krish
,
A.
Mermet
,
M.
Soltwish
, and
R.
Verbini
,
Phys. Rev. Lett.
80
,
544
(
1998
).
14.
A.
Faivre
,
L.
David
,
R.
Vassoille
,
G.
Vigier
,
S.
Etienne
, and
E.
Geissler
,
Macromolecules
29
,
8387
(
1996
).
15.
A.
Nittke
,
M.
Scherl
,
P.
Esquinazi
,
W.
Lorenz
,
J.
Li
, and
F.
Pobell
,
J. Low Temp. Phys.
98
,
517
(
1995
).
16.
J. M.
Crissman
,
J. A.
Sauer
, and
A. E.
Woodward
,
J. Polym. Sci., Part A: Gen. Pap.
2
,
5075
(
1964
).
17.
G.
Federle
and
S.
Hunklinger
,
J. Phys. Colloq.
43
,
C9
-
505
(
1982
).
18.
R.
Vacher
and
J.
Pelous
,
J. Chim. Phys. Phys.-Chim. Biol.
82
,
311
(
1985
).
19.
R.
Bergman
,
F.
Alvarez
,
A.
Alegria
, and
J.
Colmenero
,
J. Chem. Phys.
109
,
7546
(
1998
).
20.
J.
Wiedersich
,
S.
Adichtchev
, and
E.
Rössler
,
Phys. Rev. Lett.
84
,
2718
(
2000
).
21.
C. J. F. Böttcher and P. Bordewijk, Theory of Electric Polarization (Elsevier, Amsterdam, 1978), Vol. 2.
22.
A.
Kisliuk
,
R. T.
Mathers
, and
A. P.
Sokolov
,
J. Polym. Sci., Part B: Polym. Phys.
38
,
2785
(
2000
).
23.
S. M.
Bezrukov
and
M.
Winterhalter
,
Phys. Rev. Lett.
85
,
202
(
2000
).
24.
S.
Maslov
,
C.
Tang
, and
Y-C.
Zhang
,
Phys. Rev. Lett.
83
,
2449
(
1999
).
25.
M. B.
Weissman
,
Rev. Mod. Phys.
60
,
537
(
1988
).
26.
L.
Comez
,
D.
Fioretto
,
L.
Palmieri
,
L.
Verdini
,
P. A.
Rolla
,
J.
Gapinski
,
T.
Pakula
,
A.
Patkowski
,
W.
Steffen
, and
E. W.
Fischer
,
Phys. Rev. E
60
,
3086
(
1999
).
27.
V. N.
Novikov
,
Phys. Rev. B
58
,
8367
(
1998
).
28.
A. P. Sokolov, A. Kisliuk, V. N. Novikov, and K. Ngai, Phys. Rev. B (in press).
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