title: Free radicals in pyrimidines: 5-thymyl radical nitrogen splitting in irradiated thymidine.
abstract: Single crystals of thymidine irradiated with 4.0 MeV electrons exhibit the well-known eight-line e.s.r. spectrum due to the 5-thymyl radical. A careful analysis of these lines revealed an extra hyperfine splitting, which by a combination of INDO-MO calculations and experiments, was attributed to an interaction between the unpaired electron and the N3-H group.
mesh_terms: D004578:Electron Spin Resonance Spectroscopy; D004583:Electrons; D005609:Free Radicals; D013936:Thymidine / Q000528:radiation effects*
chemical_list: D005609:Free Radicals; D013936:Thymidine