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Light, or electromagnetic wave, is the most powerful tool for probing the quantum mechanical motions of electrons and nuclei within molecules and condensed matter. Optical Processes in Solids describes the principles of this spectroscopic study with the help of illustrative comparisons of theoretical and experimental results that take into account the revolutionary progress brought about by the use of intense lasers and high-energy synchrotron light. In the final chapter Yutaka Toyozawa presents a speculative scenario on how solar light may have caused chemical reactions among atoms and...

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...