Abstract
The ionization quantum yield and thermalization range parameter of photoelectrons were extracted by a three-parameter adjustment from experimental curves of the photocurrent as a function of an applied electric field. Results were obtained at VUV photon energies of 0.5-2 eV above the threeshold energy in 2,2-dimethyl butane and at 10.03 eV in 2,2,4-trimethylpentane. These values were compared to those obtained when electron quenchers were added to the solvent. The same technique was carried out when excess electrons were produced by Co 60 γ-ray irradiation. With VUV irradiation, the drop in photocurrent arises mainly from the drop in the ionization quantum yield, whereas with γ-rays it is rather the thermalization distance that is affected
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