| Issue |
J. Phys. IV France
Volume 129, October 2005
|
|
|---|---|---|
| Page(s) | 55 - 59 | |
| DOI | https://doi.org/10.1051/jp4:2005129012 | |
J. Phys. IV France 129 (2005) 55-59
DOI: 10.1051/jp4:2005129012
Pressure acoustic spectroscopy of cyclic compounds
B.B.J. Linde1 and U.M. Esanov21 Institute of Experimental Physics, University of Gdansk, ul. Wita Stwosza 57, 80-952 Gdansk, Poland
2 Institute of Physics and Techniques, Academy of Sciences of Turkmenistan & TURKMENGAS
Abstract
In this paper there are presented the investigations of
high pressure influence on processes of absorption in some Kneser liquids -
in the frequency range of 30 - 110 MHz and for pressures between 0.1 and 100
MPa. The experimental results of the dependence of absorption on pressure
for measured liquids support the assumption that acoustic relaxation in
these compounds is caused by Kneser's processes. From the obtained results
we can conclude that: the absorption decreases and the relaxation time
shortens when the pressure grows, which is in accordance with predictions
for vibrational relaxation. Hence, the increase of pressure results in the
increasing of the number of collisions, thus increasing the probability of
energy transfer, i.e. reducing the relaxation time and acoustical
absorption. The data obtained from the measurements were interpreted
according to the theory of isolated binary collisions and allowed to
estimate the molecule diameter.
© EDP Sciences 2005