Absolute Yield Measurements of Radiation-Produced Radicals by Electron Spin Resonance

Abstract

The method of measuring the concentration of paramagnetic centers is considered systematically. Instrumental accessories are discussed in detail, especially a double sample cavity for comparisons at different temperatures which employs 100 kc modulation, and also a first moment balance which allows the determination of relative concentrations in a very simple way. In addition the yields of radicals produced by x-irradiation in amino acid compounds were re-measured and the results compared with those of others. The values are between 20 and 80 ev per radical, except for aromatic amino acids which need higher energies.