13 



solution. By determining the concentration at which polarization is 

 lost, the distance can be found at which electromagnetic inter- 

 action is possible. This critical distance may even exceed 100 A. 



o 



A 



200 



(80 



160 



140 



120 



»0 



80 



60 



40 



20 





M 10' 



10' 



-3 



^-2 



10" 



Fig. 3. Relation of statistical distance between molecules and molar 

 concentration. If the solution contains two different substances, then the 

 statistical distance between their molecules is about 70% of the values 

 given by the curve. 



which corresponds to a concentration of the order of 10"^ M. The 

 diameter of many macromolecules is of this magnitude; so E* can 

 be transmitted between atomic groups of the same macromolecule 

 or of neighboring molecules also by their electrodynamic coupling. 

 One point we must mark well about this transmission: no photons 

 are involved. It is not that the first molecule, absorbing the light, 

 emits a photon again which then is absorbed by the second mole- 



