| 1. | Higher order anharmonicity terms can be accounted by using perturbative methods.
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| 2. | In 1D thermal expansion is cased by anharmonicity of interatomic potential only.
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| 3. | The difference is not exact because there is anharmonicity in both vibrations.
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| 4. | This trend matches the anharmonicity found in real molecules.
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| 5. | However, when anharmonicity is taken into account, the transitions are weakly allowed.
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| 6. | Where ? and ( ?x ) indicates respectively, the basic vibrational frequency and the anharmonicity constant.
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| 7. | It is a measure of the anharmonicity of the system and closely related to the thermal expansion.
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| 8. | However, when the vibrational amplitudes are large, for example at high temperatures, anharmonicity becomes important.
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| 9. | In classical mechanics, "'anharmonicity "'is the numerical techniques have to be used.
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| 10. | The technical terms for the subjects of his studies are anharmonicity, asphericity, anelasticity, as well as anisotrophy.
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