抄録
The electric conduction mechanism is studied on the basis of the exchange of unpaired electrons. In the discussion that follows, it will be noted that the theoretical values of electrical conductivity derived from the equation based on the hopping of the exchange of unpaired electrons in the crystals, are in a fairly good agreement with the values obtained in experiments which involve measurements of electron spin resonance (ESR), electrical conductivity, magneto-resistance and photoconduction. Specimens used are mixed crystals of α, α′-diphenyl-β-picrylhydrazyl (DPPH) and α, α′-diphenyl-β-picrylhydrazine (DPPH2).