Spectrum of fast dynamics in glass forming liquids: Does the "knee" exist?

J. Gapiński; W. Steffen; A. Patkowski; A. P. Sokolov; A. Kisliuk; U. Buchenau; M. Russina; F. Mezei; H. Schober

doi:10.1063/1.477966

Spectrum of fast dynamics in glass forming liquids: Does the "knee" exist?

J. Gapiński, W. Steffen, A. Patkowski, A. P. Sokolov, A. Kisliuk, U. Buchenau, M. Russina, F. Mezei, H. Schober

Research output: Contribution to journal › Article › peer-review

75 Scopus citations

Abstract

A knee-shaped feature observed earlier in light scattering spectra of Ca_0.4K_0.3(NO₃)_1.4 (CKN) below T_c is used as a strong argument in favor of mode-coupling theory of the glass transition (MCT). Our careful measurements reveal no "knee" in the spectra of two glass forming liquids, CKN and ortho-terphenyl. Instead of the knee the spectra show nontrivial broadening and an increase of the intensity with a temperature increase. Both variations are confirmed by neutron scattering measurements on CKN and are neither expected in the asymptotic MCT predictions nor in any other model.

Original language	English
Pages (from-to)	2312-2315
Number of pages	4
Journal	Journal of Chemical Physics
Volume	110
Issue number	5
DOIs	https://doi.org/10.1063/1.477966
State	Published - Feb 1 1999
Externally published	Yes

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abstract = "A knee-shaped feature observed earlier in light scattering spectra of Ca0.4K0.3(NO3)1.4 (CKN) below Tc is used as a strong argument in favor of mode-coupling theory of the glass transition (MCT). Our careful measurements reveal no {"}knee{"} in the spectra of two glass forming liquids, CKN and ortho-terphenyl. Instead of the knee the spectra show nontrivial broadening and an increase of the intensity with a temperature increase. Both variations are confirmed by neutron scattering measurements on CKN and are neither expected in the asymptotic MCT predictions nor in any other model.",

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T2 - Does the "knee" exist?

AU - Gapiński, J.

AU - Steffen, W.

AU - Patkowski, A.

AU - Sokolov, A. P.

AU - Kisliuk, A.

AU - Buchenau, U.

AU - Russina, M.

AU - Mezei, F.

AU - Schober, H.

PY - 1999/2/1

Y1 - 1999/2/1

N2 - A knee-shaped feature observed earlier in light scattering spectra of Ca0.4K0.3(NO3)1.4 (CKN) below Tc is used as a strong argument in favor of mode-coupling theory of the glass transition (MCT). Our careful measurements reveal no "knee" in the spectra of two glass forming liquids, CKN and ortho-terphenyl. Instead of the knee the spectra show nontrivial broadening and an increase of the intensity with a temperature increase. Both variations are confirmed by neutron scattering measurements on CKN and are neither expected in the asymptotic MCT predictions nor in any other model.

AB - A knee-shaped feature observed earlier in light scattering spectra of Ca0.4K0.3(NO3)1.4 (CKN) below Tc is used as a strong argument in favor of mode-coupling theory of the glass transition (MCT). Our careful measurements reveal no "knee" in the spectra of two glass forming liquids, CKN and ortho-terphenyl. Instead of the knee the spectra show nontrivial broadening and an increase of the intensity with a temperature increase. Both variations are confirmed by neutron scattering measurements on CKN and are neither expected in the asymptotic MCT predictions nor in any other model.

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Spectrum of fast dynamics in glass forming liquids: Does the "knee" exist?

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