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An exciton is an electronic excitation wave consisting of an
electron-hole pair which propagates in a nonmetallic solid. Since
the pioneering research of Fren kel, Wannier and the Pohl group in
the 1930s, a large number of experimental and theoretical studies
have been made. Due to these investigations the exciton is now a
well-established concept and the electronic structure has been
clarified in great detail. The next subjects for investigation are,
naturally, dynamical processes of excitons such as excitation,
relaxation, annihilation and molecule formation and, in fact, many
interesting phenomena have been disclosed by recent works. These
excitonic processes have been recognized to be quite important in
solid-state physics because they involve a number of basic
interactions between excitons and other elementary excitations. It
is the aim of this quasi monograph to describe these excitonic
processes from both theoretical and experimental points of view. we
take a few To discuss and illustrate the excitonic processes in
solids, important and well-investigated insulating crystals as
playgrounds for excitons on which they play in a manner
characteristic of each material. The selection of the materials is
made in such a way that they possess some unique properties of
excitonic processes and are adequate to cover important
interactions in which excitons are involved. In each material,
excitonic processes are described in detail from the experimental
side in order to show the whole story of excitons in a particular
material."
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