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@ARTICLE{Faraone:201678,
author = {Faraone, Antonio and Hong, Kunlun and Kneller, Larry R. and
Ohl, Michael and Copley, John R. D.},
title = {{C}oherent dynamics of meta-toluidine investigated by
quasielastic neutron scattering},
journal = {The journal of chemical physics},
volume = {136},
number = {10},
issn = {0021-9606},
address = {Melville, NY},
publisher = {American Institute of Physics},
reportid = {FZJ-2015-03972},
pages = {104502 -},
year = {2012},
abstract = {The coherent dynamics of a typical fragile glass former,
meta-toluidine, was investigated at the molecular level
using quasielastic neutron scattering, with time-of-flight
and neutron spin echo spectrometers. It is well known that
the static structure factor of meta-toluidine shows a
prepeak originating from clustering of the molecules through
hydrogen bonding between the amine groups. The dynamics of
meta-toluidine was measured for several values of the
wavevector transfer Q, which is equivalent to an inverse
length scale, in a range encompassing the prepeak and the
structure factor peak. Data were collected in the
temperature range corresponding to the liquid and
supercooled states, down to the glass transition. At least
two dynamical processes were identified. This paper focuses
on the slowest relaxation process in the system, the
α-relaxation, which was found to scale with the macroscopic
shear viscosity at all the investigated Q values. No
evidence of “de Gennes” narrowing associated with the
prepeak was observed, in contrast with what happens at the Q
value corresponding to the interparticle distance. Moreover,
using partially deuterated samples, the dynamics of the
clusters was found to be correlated to the single-particle
dynamics of the meta-toluidine molecules.},
cin = {ICS-1 / Neutronenstreuung ; JCNS-1 / JCNS-SNS},
ddc = {540},
cid = {I:(DE-Juel1)ICS-1-20110106 / I:(DE-Juel1)JCNS-1-20110106 /
I:(DE-Juel1)JCNS-SNS-20110128},
pnm = {451 - Soft Matter Composites (POF2-451) / 54G - JCNS
(POF2-54G24)},
pid = {G:(DE-HGF)POF2-451 / G:(DE-HGF)POF2-54G24},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000301664600023},
doi = {10.1063/1.3691185},
url = {https://juser.fz-juelich.de/record/201678},
}