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4. Phonons Crystal Vibrations

4. Phonons Crystal Vibrations. Vibrations of Crystals with Monatomic Basis Two Atoms per Primitive Basis Quantization of Elastic Waves Phonon Momentum Inelastic Scattering by Phonons. Harmonic approximation: quadratic hamiltonian : elementary excitations.

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2.07k views • 14 slides

Anharmonic Effects

Anharmonic Effects. Any real material more strongly resists compression to a volume smaller than its equilibrium value more than expansion due to a larger volume.

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158 views • 13 slides

Infrared Spectroscopy (IR)

Vibrational spectroscopy is an energy sensitive method and is used to characterize compounds in terms of the strengths and number of the bonds present. One can get/detect: the presence of known compounds (finger print) the components of an unknown compound (functional groups)

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Harmonic approximation - PowerPoint PPT Presentation

4. Phonons Crystal Vibrations

Anharmonic Effects

Infrared Spectroscopy (IR)