Excitation cross-sections of PrI were measured at an electron energy 3
0 eV for 82 spectral lines. We have used the method of extended crossi
ng beams with detection of the optical signal. For half of the total n
umber the energy dependences were measured in the electron energy rang
e of 0...200 eV. The largest measured excitation cross-sections reach
(5-8) x 10(-16) cm2. A classification is suggested for 18 previously u
nclassified lines.