A mechanism for ageing in a deeply supercooled molecular glass†
Andrew
Cassidy, 
*a
Mads R. V.
Jørgensen,
b
Artur
Glavic,
c
Valeria
Lauter,
*d
Oksana
Plekan
e
and
David
Field
a
*a
Mads R. V.
Jørgensen,
b
Artur
Glavic,
c
Valeria
Lauter,
*d
Oksana
Plekan
e
and
David
Field
a
Abstract
Measurements of the decay of electric fields, formed spontaneously within vapour-deposited films of cis-methyl formate, provide the first direct assessment of the energy barrier to secondary relaxation in a molecular glass. At temperatures far below the glass transition temperature, the mechanism of relaxation is shown to be through hindered molecular rotation. Magnetically-polarised neutron scattering experiments exclude diffusion, which is demonstrated to take place only close to the glass transition temperature.
- This article is part of the themed collection: 2021 Emerging Investigators
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