Emission spectra and excitation functions of Cs2, NO, N2O, and NO2 by low energy electron impact

Emission spectra of CS2, NO, N2O, and NO2 in the region 240-650 nm and their excitation cross section curves (excitation functions) were obtained under low energy electron impact (2-25 eV) at a gas pressure of 10-6-10-5 Torr. The excitation functions obtained were for the following processes: (1) CS2→CS2 , (2) NO→NO (A) , (3) N2O→N2(C3PIsub(u))+O, (4) N2O→N2O+ +e-, (5) NO2→NO2 , (6) NO2→NO(A and/or B)+O. The lowest emission state of 3Σsub(u)+ besides the 3A2 state for CS2 was observed in the region 400-600 nm. The excitation function for NO2 supported the existence of the two emission states (the doublet and quartet states) in the region 400-600 nm. Some resonant peaks were found in the excitation functions for CS2, NO, and NO2. The apparent features of the curves for the process (4) were consistent with the threshold law. (auth.)