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anharmonicity

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anharmonicity [¦an‚här·mə′nis·əd·ē]
(physics)
Mechanical vibration where the restoring force acting on a system does not vary linearly with displacement from equilibrium position.
Variation from a linear relationship of dipole moment with internuclear distance in the infrared portion of the electromagnetic spectrum.


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The authors discuss how clusters are used as dissipative structures, and how they are subsequently interrelated with fluctuation-free volume models, percolation systems and the Anharmonicity Concept.
This coupling gives rise not only to strong anharmonicity for these phonon modes, but to a large non-linear electron-phonon coupling that explains the high [T.
We note that the thermal expansivity [Alpha] in Eq 4 is assumed to be caused by the anharmonicity of molecular vibrations.
 
 
 
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