Brillouin scattering of simple molecular liquids at high pressure

Author

Ahart, Muhtar ; Jiang, Fuming ; Park, In Sung ; Mikami, Masayuki ; Kojima, Seiji

Author_Institution

Inst. of Appl. Phys., Tsukuba Univ., Ibaraki, Japan

Volume

1

fYear

1998

fDate

6/20/1905 12:00:00 AM

Firstpage

771

Abstract

The pressure dependences of the longitudinal acoustic mode (LA) of methanol, ethanol and toluene were measured by Brillouin scattering in the backward scattering geometry with the scattering angle 120° up to 3 GPa. Except methanol, toluene and ethanol freeze at 1.7 and 2.7 GPa, respectively. The linewidth of Brillouin components of these liquids show attenuation maxima at pressure P_m(~1.5 GPa). The pressure dependence of the relaxation time was obtained. For ethanol the temperature dependence is compared with the α-relaxation time determined by dielectric measurements. It is found that the relaxation time relates to the LA-modes are much faster than those of α-relaxation

Keywords

Brillouin spectra; high-pressure effects; organic compounds; 3 GPa; Brillouin scattering; attenuation; ethanol; high pressure; linewidth; longitudinal acoustic mode; methanol; molecular liquid; pressure dependence; relaxation time; temperature dependence; toluene; Acoustic measurements; Acoustic scattering; Attenuation; Brillouin scattering; Ethanol; Geometry; Liquids; Methanol; Pressure measurement; Temperature dependence;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE

ISSN

1051-0117

Print_ISBN

0-7803-4095-7

Type

conf

DOI

10.1109/ULTSYM.1998.762261

Filename

762261