Excitation cross-section of PrI were measured at an electron energy 30 eV for 82 specral lines. We have used the method of extended crossing beams with detection of the optical signal. For half of the total number the energy dependences were measured in the electron energy range of 0...200 eV. The largest measured excitation cross-sections reach (5-8) ×10-16 cm2. A classification is suggested for 18 previously unclassified lines

143 line emission cross-sections of Ca I and 15 line emission cross-sections of Ca II have been measured at an electron energy of 30eV. The optical excitation functions (OEF) are recorded in a range of electron energy from 0 to 200eV: 59 OEF for Ca I and 5 OEF for Ca II. The investigated lines are located in a spectrum region 227-745 nm. For the cross-sections of 5 singlet series and 10 triplet ones of Ca I, consideration has been given to series relationships that are characterized by the power relationship between the cross-section value and the principal quantum number of the upper level. Deviations from the power relationship take place in the perturbed Ca I series. The perturbations manifest themselves also by changing the OEF shape.

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Inelastic collisions, between electrons of low and medium energies and H2O molecules, that give rise to the appearance of optical radiation were studied. An experiment was performed with a gas-filled cell using an extended beam of monokinetic electrons to excite the molecules. A spectrum appearing in the visible region was identified as belonging to H2O+. About 430 excitation cross sections attributed to 10 subbands of the [Formula: see text] system were measured. For a number of lines, measurements were made of the optical excitation functions in the range of energies from the excitation threshold to 200 eV.