1. The virtual state argument is quite orthogonal to the anharmonic oscillator argument. 2. The best known example is the sextic QES anharmonic oscillator with the Hamiltonian 3. Alternatively, the material may react in an anharmonic fashion to the fields. 4. The two most important anharmonic effects are the thermal expansion and the phonon thermal conductivity. 5. The anharmonic group is generated by and. 6. This behavior is an extension of the harmonic potential, mentioned earlier, into the anharmonic regime. 7. Anharmonic oscillators, however, are characterized by the nonlinear dependence of the restorative force on the displacement x.8. For this reason, anharmonic motion can be approximated as harmonic motion as long as the oscillations are small. 9. This group is called the anharmonic group . talk ) 12 : 18, 15 September 2014 ( UTC) 10. The method proved too difficult to immediately apply to realistic problems, so Heisenberg turned to a simpler example, the anharmonic oscillator.
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