Yield of Carrier Generation in Organic Solids Under Electron Bombardment. II

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Abstract
The yield of carriers generated in organic solids by electron bombardment, or by X- or γ-rays, should be independent of the primary electron energy above 5 keV, independent of the field applied to the solid between ∼103 and a critical field of about 104 V/cm at room temperature, and roughly proportional to temperature in this range. Above the critical field, the observed yield should increase with the applied field and be very weakly temperature dependent. The comparison of the yields in different materials is a way of investigating the mechanisms of thermalization of secondary electrons, as the only other material-dependent parameter, the optical dielectric constant, is only slightly variable. The yield of carriers generated by low energy (MeV) protons, deutons and alpha-particles should be proportional to the particle track length, and should vary with temperature and with electric field (normal to the track), approximately as the yield under electron bombardment.