Abstract

This chapter illustrates the spectra resulting from vibrational transitions in solids. It describes the vibrational part of the internal energy. The transitions between different vibrational energy levels give rise to the near infrared emission or absorption spectra and are stimulated provided there is a change of dipole moment connected with such a transition. The factor group analysis and the normal modes of oscillation of brucite are discussed in the chapter. The chapter describes the vibrational spectra of a number of crystals of varying composition and structure. The vibrational and rotational transitions in a molecule may also be induced in another way by the scattering of light. Under certain conditions, the electric field of an incident radiation may induce a dipole moment and the molecule can, thus, interchange energy with the photon. This exchange produces the Raman spectrum that in its structure resembles the infrared spectrum, although the two originate from two different processes—namely light scattering and absorption or emission of radiation.

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