Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
115 (2001), S. 8958-8966
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
We present a neutron scattering study on methyl group dynamics in glassy toluene. The spectra in the whole temperature range, covering the transition from quantum rotational tunneling to classical hopping, have been successfully analyzed in terms of a potential barrier distribution model. The average barrier in the glass is found to be notably higher than the unique barrier of the crystalline β-phase, whose short-range structure is known to be similar to that of the glass. Due to the mainly intermolecular origin of the interactions on the methyl groups in toluene, it is concluded that the rotational potentials are strongly affected by structural disorder. © 2001 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1413742
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