Electron Spin Resonance of Single Crystals of Cystine Dihydrochloride Irradiated with Monochromatic uv Radiation at Various Wavelengths

Abstract

Single crystals of cystine dihydrochloride were irradiated at room temperature with monochromatic uv radiation. The optical bandwidth was about 20 Å for each wavelength used. Essentially two ESR centers were observed, the relative yield being approximately 1. One center is identified as the RS radical also detected after γ irradiation at room temperature, the second center is tentatively identified as a RS radical stabilized in an environment different from that of the first mentioned RS radical or alternatively as the RSS⁺R radical ion.