Velocity and damping of thermal phonons in isomeric alcohols
- 1 March 1989
- journal article
- research article
- Published by Taylor & Francis in Molecular Physics
- Vol. 66 (4) , 819-829
- https://doi.org/10.1080/00268978900100551
Abstract
Polarized Mandelstam-Brillouin scattering data in isomeric pentanols (normal-pentanol and 2-methyl-2-butanol) are presented. Hypersonic velocity νs and absorption α/f 2 are measured as a function of temperature in the liquid phase. The experimental results indicate, for both the alcohols, a shear relaxation phenomenon in the GHz region. The shear relaxation times τs and the shear moduli G ∞, evaluated in the framework of visco-elastic theories, show a temperature dependence characteristic of strongly associated liquids in n-pentanol, whereas a more molecular behaviour is evidenced for 2-methyl-2-butanol.Keywords
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