Luminescence of Tl+-doped KCl, KBr, and Kl evaporated thin films at 290 and 77 °K is excited by slow electron impact. Emission spectra at ≥ 15 eV excitation correspond to those observed under uv excitation, but they are insensitive to the electron energy. The excitation spectra resemble closely the characteristic electron energy loss spectra of the pure alkali halides, the latter being unchanged by 10−3 mole fraction of thallous halide. Of the three pure alkali halides, only KI emits intrinsic luminescence at 77°K and only KI:Tl+ emits both intrinsic and Tl+-characteristic luminescence at 77°K. The A, B, C, and D absorption bands of Tl+ overlap the lower part of the excitation spectrum for electron impact, but that is required by the energetics. All luminescence excitations, including those below the first optical exciton, appear to be intrinsic to the alkali halide. In that case, all excitations involve migration of excitons, including those below the first optical exciton.