SPECIFIC EXCITATION OF SOME HEAD BANDS OF N_2 AND N_2~+ MOLECULES IN A CYLINDRICAL HOLLOW CATHODE ELECTRIC DISCHARGE (HCED)

摘要

The purpose of this paper is to use the nonmaxwellisation of the electron's energy distribution produced in the molecular gas of an HCED, to explain a specific excitation of the neutral N_2 molecule [2~+ system] or of the ionical nitrogen molecule [1~- system], in pure N_2 gas. The head bands relative intensity distribution give very important information about the excitation processes localization and electron temperature distribution evaluation. We have established the existence of the direct electron-molecule collision excitation of the upper neutral or ionical molecular levels and also the fact that the intensity distribution of some band heads is not the same with the upper vibrational levels of the neutral molecule density (N_(v′) = 4) distribution.