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Vibrtational Relaxation Liquids

Linde B.

Molecular and Quantum Acoustics

2002

Vol. 23

239-251

In the paper there is presented the theory of vibrational relaxation in fluids as well as the experimental investigations in the Kneser liquids: tiazole and furane. From these results it was possible to conclude that in this relaxation process with one relaxation time take part all vibrational degrees of freedom.

Influence of the Frequency Range Broadening for the Value of the Acoustic Vibrational Relaxation Time

Linde B., Lezhney N.

Molecular and Quantum Acoustics

1999

Vol. 20

143-148

In the present paper, the authors discuss studies carried out for many years by numerous acoustics researchers, dealing particularly with two compounds: benzene and carbon disulphide. They are typical liquids in which acoustic Kneser-type relaxation occurs, caused by an irreversible vibrational-translational (VT) transition. Since magnitudes describing the relaxation process were diverse in many papers, we have undertaken an attempt to clarify these differences and to indicate how to avoid errors resulting from instrumental imperfections and the disregard of considerable measurement errors when investigating velocity dispersion in the hypersonic range.