| 1. | In crystals excitons interact with phonons, the lattice vibrations.
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| 2. | In a crystal lattice vibration, atomic positions vary.
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| 3. | The quantum of lattice vibration is called phonon.
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| 4. | It is caused by collisions of the electron with lattice vibrations and other electrons.
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| 5. | However, the energy in a decay can be taken up or supplied by lattice vibrations.
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| 6. | This phenomenon is usually modeled by assuming that lattice vibrations cause small shifts in energy bands.
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| 7. | The second approximation is that only the lowest ( zero-point ) lattice vibration is excited.
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| 8. | On the other hand, heat conductivity in nonmetals is mainly due to lattice vibrations ( phonons ).
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| 9. | For example, in crystalline solids, these correspond to phonons, which are quantized versions of lattice vibrations.
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| 10. | Are there lattice vibrations in a plasma ? talk ) 11 : 55, 20 November 2012 ( UTC)
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