This book gives a semiquantitative understanding of the properties
observed in luminescence, i.e., where energy absorption and emission
occur, and with what efficiency these conversion processes take place.
The authors give a correct treatment of the offset dependence and the
temperature dependence of nonradiative rates. The Wp function is defined
as the sum of thermally weighted Franck-Condon factors. It is obtained
in one dimension in several forms, and a useful recursion relation is
derived between Wp's with nearby p indices.