With the help of electron impact spectrometer, energy loss spectra for carbazole vapour were measured in the energy range of the incident beam of electrons from 4 to 50 eV. Both optically resolved transitions S<sub>0</sub>-S<sub>n</sub> and the forbidden transition S<sub>0</sub>-T<sub>1</sub> were registered. Besides, spectra of fluorescence of molecules excited by electron beam with energy from the process threshold up to 500 eV were investigated and optical excitation functions of fluorescence band were measured.
The main characteristics of interaction of monokinetic electrons with different energies in the range from 0 to 50 eV at an angle 90 degree(s) (electron energy loss spectra, luminescence excitation functions, and luminescence spectra) for some lasing potential organic materials (paraquaterphenyl, 1,4-bis[2-(5- phenyloxazolyl)]benzene (POPOP), 2,5-biphenyloxazole (PPO), perylene, (beta) -binaphthilenoxide (dinaphthofuran), and 4-methylamino-N-(o-tolyl)-1,8-naphthalimide) are presented and analyzed. It was shown the correlation between elastic and inelastic scattering. It was found that the nature of electron and photon excitations is similar. Direct population of triplet states for most of studied compounds is negligible. The substances with intensive longwave singlet band (perylene, POPOP, PPO, naphthalimide) are very attractive for lasing search in electroluminescent cell. Calculation of excitation rates based on Born approximation results in essential error.