Low-energy electron scattering by anthracene and 1, 4-di 2-(5-phenyloxazolyl) -benzene (POPOP) vapors at low pressures is studied. The primary electron beam energy EOwas varied between 10 and 60 eV. The scattering angle was = 90°. It has been found that in the electron-energy-loss spectra, bands with maxima of 3·7 and 5·41 eV for anthracene, 4.02 and 7 eV for POPOP correspond to the SO→ S1and So→ S2transitions. Low intensity electron-energy loss due to T2-states excitation has been observed in the region of 2·15 eV for anthracene and 2·54 eV for POPOP. From comparison with optical absorption spectra and analysis of spectra structure changes at different EOthe nature of other bands has been determined. From the obtained results it was concluded that the probability of T1-state excitation is low. It is shown that the main mechanism of populating the T1-state by electric methods of vapor pumping is the process of intersystem crossing.