Abstract
The ions forming the attractively acting lattice are not rigid. At least their oscillations around the rigid lattice positions have to be taken into account. These oscillation may be quantized and interpreted as bosonic particles called acoustical or optical phonons with typical spectra. Even a classical description of the phonons gives rise to important predictions as the Lyddane-Sachs-Teller formula. In a quantum mechanical approach to optical transitions assisted by phonons one may understand the Franck-Condon effect.
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Bányai, L.A. (2018). Phonons. In: A Compendium of Solid State Theory. Springer, Cham. https://doi.org/10.1007/978-3-319-78613-1_4
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DOI: https://doi.org/10.1007/978-3-319-78613-1_4
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Online ISBN: 978-3-319-78613-1
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