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.
c]) is a function of mass change due to defect, anharmonic force constants and the applied electric field.
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.
Co-author Tuszynski and co-workers displayed coherent structures in binary systems, deterministic chaos in an anharmonic crystal, and patterns in critical systems.
com/research/r9gv5p/quantum_theory_of) has announced the addition of Elsevier Science and Technology's new book "Quantum Theory of Anharmonic Effects in Molecules" to their offering.
The electric-field interaction modifies the harmonic elastic constant and thereby introduces an anharmonic potential term.
An analysis of states in the phase space: the anharmonic oscillator.
The yield stress for a glass composed of molecules interacting as anharmonic oscillators is predicted to be [39]:
Harmonic and anharmonic vibrational frequencies for LiH compared well with those from other ab initio methods.