Analysis of the radicals created in the TGS: Fe3+ crystal after UV-irr
adiation in the temperature 4.2 K using EPR technique are presented. B
efore UV-irradiation the low temperature (4.2 K) EPR spectra of TGS: F
e3+ due to Fe3+ ion is observed. After irradiation Fe3+ spectrum vanis
hes and new spectrum due to NH2+ radicals is observed. A model, based
on the charge transfer from the ligands (NH2CH2COO)(2) onto the centra
l ion Fe3+, is presented.