Calculations of the absorption spectra of e t– were performed using the model of electron localization in amorphous media. The model describes electron localization as the radiationless transition of an electron from the conduction state to the binding level of one of a statistical variety of the pre-existing traps in the matrix. Electron capture by very deep traps is considered as a two-stage process-electron capture by the excited level of the trap followed by relaxation to the ground state. The time evolution and the temperature dependence of the optical absorption spectra of e t– were computed for polar and nonpolar glasses. The spectral changes predicted by the model follow the experimental results provided by pulse radiolysis.