Methyl group dynamics in glassy toluene: A neutron scattering study
作者： A. J. Moreno , A. Alegrı́a , J. Colmenero , M. Prager , H. Grimm
DOI: 10.1063/1.1413742
关键词: Neutron scattering 、 Methyl group 、 Quantum tunnelling 、 Crystallography 、 Chemical physics 、 Neutron diffraction 、 Toluene 、 Rectangular potential barrier 、 Intermolecular force 、 Small-angle neutron scattering 、 Chemistry
摘要: We present a neutron scattering study on methyl group dynamics in glassy toluene. The spectra the whole temperature range, covering transition from quantum rotational tunneling to classical hopping, have been successfully analyzed terms of potential barrier distribution model. average glass is found be notably higher than unique crystalline β-phase, whose short-range structure known similar that glass. Due mainly intermolecular origin interactions groups toluene, it concluded potentials are strongly affected by structural disorder.
core.ac.uk
harvard.edu
scitation.org
sci-hub.se 参考文章(26)
Tasso Springer, Quasielastic Neutron Scattering for the Investigation of Diffusive Motions in Solids and Liquids ,(1972)
A C Hewson, The temperature dependence of inelastic neutron scattering in rotational tunnelling systems. I. Formulation and perturbation theory Journal of Physics C: Solid State Physics. ,vol. 15, pp. 3841- 3853 ,(1982) , 10.1088/0022-3719/15/18/003
J. Colmenero, A. Chahid, A. Alegria, Methyl group dynamics in poly(vinyl methyl ether). A rotation rate distribution model Macromolecules. ,vol. 27, pp. 3282- 3288 ,(1994) , 10.1021/MA00090A022
A. W�rger, The temperature dependence of rotational tunnelling European Physical Journal B. ,vol. 76, pp. 65- 76 ,(1989) , 10.1007/BF01323488
S Clough, A Heidemann, M Paley, The temperature dependence of methyl tunnelling motion in three acetates Journal of Physics C: Solid State Physics. ,vol. 14, pp. 1001- 1008 ,(1981) , 10.1088/0022-3719/14/7/006
A. J. Moreno, A. Alegría, J. Colmenero, B. Frick, Isotope effect on the rotational tunneling transitions of methyl groups in glassy polymers Physical Review B. ,vol. 59, pp. 5983- 5986 ,(1999) , 10.1103/PHYSREVB.59.5983
A. Heidemann, M. Prager, M. Monkenbusch, Methyl rotation in acetamide: the transition from quantum mechanical tunneling to classical reorientation studied by inelastic neutron scattering European Physical Journal B. ,vol. 76, pp. 77- 88 ,(1989) , 10.1007/BF01323489
A. J. Moreno, A. Alegría, J. Colmenero, Methyl group dynamics in glassy systems: Crossover from quantum to classical regime Physical Review B. ,vol. 63, pp. 060201- ,(2001) , 10.1103/PHYSREVB.63.060201
D. van der Putten, G. Diezemann, F. Fujara, K. Hartmann, H. Sillescu, Methyl group dynamics in α-crystallized toluene as studied by deuteron spin-lattice relaxation Journal of Chemical Physics. ,vol. 96, pp. 1748- 1757 ,(1992) , 10.1063/1.462130
O. Schärpf, H. Capellmann, The XYZ-Difference Method with Polarized Neutrons and the Separation of Coherent, Spin Incoherent, and Magnetic Scattering Cross Sections in a Multidetector† Physica Status Solidi (a). ,vol. 135, pp. 359- 379 ,(1993) , 10.1002/PSSA.2211350204