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.
References in periodicals archive ?
100]Ru isotope between the spherical anharmonic vibrator [sup.
Loss in many high-purity crystals is primarily intrinsic in that a crystal will vibrate nearly harmonically; however, anharmonic coupling to the electric field and the presence of defects modifies this behavior.
In the NIR region, the overtones are anharmonic, impeding interpretation of the NIR spectra.
The heat conduction mechanism in dielectric solids was thought as either the propagation of anharmonic elastic waves through a continuum or the interaction between quanta of thermal energy or phonons (24).
In the present work we have theoretically studied the electric field and defect dependent Curie temperature in anharmonic Ba1-xCaxTi[O.
Elastic Behavior of Polymers: Anharmonic and Relaxational Effects.
Specific topics covered include the measurement of kinetic and anharmonic isotope effects, computer simulation of isotope effects in enzyme catalysis, and isotope effects for exotic nuclei.
MICHEL, A Multiscale Method for the Gravimetry Problem--Theoretical and Numerical Aspects of Harmonic and Anharmonic Modelling.
harmonic oscillator, anharmonic oscillator, hydrogen atom, electron spin and orbital angular momentum, and pair-production in QED vacuum).
The pattern needed to make this happen, known as an anharmonic vibration, requires that the speed of the vibrations depend on their size.
I also continued in gas phase kinetics; theory of unimolecular reactions, quantum theory of inelastic scattering, and anharmonic vibrations in polyatomic molecules.