ELECTRON SPIN RESONANCE OF GAMMA-IRRADIATED TRIGLYCINE SULFATE .I. HINDERED MOTION OF CH2 IN A FREE RADICAL CH2COO-

Three species of radicals were observed. One of these was already identified as NH3ĊHCOO- by Ovenall et al. and by Blinc et al․. One of the other species, which appears as a triplet with an intensity ratio of 1:2:1, is identified as ĊH2COO-. The principal values of A- and g-tensor of the radical are determined to be 25.1, 19.6 and 16.7 gauss and 1.9994, 1.9999 and 2.0009, respectively. From the temperature dependence of the spectra, it is concluded that the two protons in the ĊH2COO- exchange their sites with each other through a rotation of the ĊH2 group about the C–CN bond. © 1969, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.