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Relaksacja oscylacyjna w związkach halogenopodstawnych benzenu

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Linde B. B. J. , Lezhnev N. B.

Prace Naukowe Instytutu Telekomunikacji i Akustyki Politechniki Wrocławskiej. Konferencje

2001

tom Vol. 83, nr 27

413-418

The acoustic investigations in the group of halogenated benzenes compounds and particularly research of the dependencies of acoustic parameters and the structure of the organic liquids, demonstrated some interesting regularities in the group of these compounds in gas and liquid states. In this paper the results of research in five cyclic liquids: bromo-, chloro-, fluoro- and jodobenzene were discussed in comparison to the benzene. The acoustic relaxation observed in all the compounds was found to result from Kneser's processes (vibrational relaxation). Based on investigations reported in this paper, as well as other, both experimental and literature data concerning a great number of compounds, one can draw a conclusion that almost all acoustic relaxation (Kneser-type) processes in liquids can be described using one relaxation time. It also seems that all vibrational degrees of freedom of the molecule take part in this process. It is known that arising of differences in transition probabilities could be caused by additional attraction in interaction of molecules having the dipole moments. A high value of dipole moments of halogenobenzenes with adequate benzene could be responsible for the difference of transition probabilities and changes of the relaxation times.

Acoustical investigation of classical kneser liquids

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Linde B. B. J. , Lezhnev N. B.

2007

tom Vol. 28

187-194

In this paper the experimental values of acoustical parameters determined from ultrasonic spectroscopy for eleven Kneser liquids are presented. The experimental data give the possibility to calculate several values describing acoustical relaxation. From these results it was possible to conclude that in the relaxation process with one relaxation time all vibrational degrees of freedom take part.