Transfer and Storage of Energy by Molecules 4. [antikvár]

Preface This, the fourth volume in the series dealing with molecular energy transfer processes, is devoted to those phenomena pecuUar to the solid state. In this context two characteristics of solids are of paramount importance: the fact that molecules or constituent atoms are in a constant situation of interaction with their neighbours, and that the solid may or may not be characterised by long range order. The first of these features leads to the possibility of facile energy migration as excitons, phonons or magnons, and the second determines the characteristic behaviour of the migration processes. Starting with electronic processes, the volume deals first with energy transfer as excitons in molecular crystals and semiconductors, and then moves to consider those situations where the electrons themselves (or defect electrons) transport energy by conduction in crystalline and amorphous solids. The second group of articles covers various forms of vibrational energy starting from coordinated molecular vibrations as phonons in crystalline and amorphous solids, including the more localised higher frequency modes evidenced in Raman and infra-red spectroscopy, and concluding with the lower frequency acoustic phenomena observed in ordered systems. Finally, the volume includes two articles on the transfer of magnetic energy, dealing with nuclear spin energy exchange in solids, and the more general aspects of magnon and related processes.