On the Transformation of light into Heat in Solids. I

J. Frenkel
1931 Physical Review  
Starting from the analogy between a crystal and molecule, it is shown that the electronic excitation, forming the first step in the process of light absorption, is not confined to a particular atom, but is diluted between all of them in the form of "excitation waves, " similar to sound waves which are used to describe the heat motion in the
doi:10.1103/physrev.37.17 fatcat:vn6l52v4gvhixmkapcspao5hl4