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000201678 1001_ $$0P:(DE-HGF)0$$aFaraone, Antonio$$b0$$eCorresponding Author
000201678 245__ $$aCoherent dynamics of meta-toluidine investigated by quasielastic neutron scattering
000201678 260__ $$aMelville, NY$$bAmerican Institute of Physics$$c2012
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000201678 520__ $$aThe coherent dynamics of a typical fragile glass former, meta-toluidine, was investigated at the molecular level using quasielastic neutron scattering, with time-of-flight and neutron spin echo spectrometers. It is well known that the static structure factor of meta-toluidine shows a prepeak originating from clustering of the molecules through hydrogen bonding between the amine groups. The dynamics of meta-toluidine was measured for several values of the wavevector transfer Q, which is equivalent to an inverse length scale, in a range encompassing the prepeak and the structure factor peak. Data were collected in the temperature range corresponding to the liquid and supercooled states, down to the glass transition. At least two dynamical processes were identified. This paper focuses on the slowest relaxation process in the system, the α-relaxation, which was found to scale with the macroscopic shear viscosity at all the investigated Q values. No evidence of “de Gennes” narrowing associated with the prepeak was observed, in contrast with what happens at the Q value corresponding to the interparticle distance. Moreover, using partially deuterated samples, the dynamics of the clusters was found to be correlated to the single-particle dynamics of the meta-toluidine molecules.
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000201678 7001_ $$0P:(DE-HGF)0$$aHong, Kunlun$$b1
000201678 7001_ $$0P:(DE-HGF)0$$aKneller, Larry R.$$b2
000201678 7001_ $$0P:(DE-Juel1)130872$$aOhl, Michael$$b3$$ufzj
000201678 7001_ $$0P:(DE-HGF)0$$aCopley, John R. D.$$b4
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