Metabasin transitions are Johari-Goldstein relaxation events

被引：24

作者：

Cicerone, Marcus T. ^{[1
,2
]}

Tyagi, Madhusudan ^{[1
,3
]}

机构：

[1] NIST, Gaithersburg, MD 20899 USA

[2] Univ Maryland, Inst Phys Sci & Technol, College Pk, MD 20742 USA

[3] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

来源：

JOURNAL OF CHEMICAL PHYSICS | 2017年 / 146卷 / 05期

基金：

美国国家科学基金会;

关键词：

SUPERCOOLED ORTHO-TERPHENYL; NUCLEAR-MAGNETIC-RESONANCE; ORGANIC GLASS FORMERS; SLOW BETA-PROCESS; VISCOUS-LIQUIDS; DYNAMIC HETEROGENEITIES; STRUCTURAL RELAXATION; SECONDARY RELAXATIONS; PROPYLENE CARBONATE; NEUTRON-SCATTERING;

D O I：

10.1063/1.4973935

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We show that by representing quasi-elastic and inelastic neutron scattering from propylene carbonate (PC) with an explicitly heterogeneous model, we recover signatures of two distinct localized modes in addition to diffusive motion. The intermediate scattering function provides access to the time-dependence of these two localized dynamic processes, and they appear to correspond to transitions between inherent states and between metabasins on a potential energy landscape. By fitting the full q-dependence of inelastic scattering, we confirm that the Johari-Goldstein (beta(JG)) relaxation in PC is indistinguishable from metabasin transitions.

引用

页数：9

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