DISSOCIATIVE EXCITATION, IONIZATION, AND FRAGMENTATION PROCESSES FOR NITROGEN, OXYGEN, METHANE, AND WATER MOLECULES BY ELECTRON BOMBARDMENT


Electron–impact ionization and fragmentation of molecules are investigated by the chromatography mass-spectrometry device. While the excitation processes are investigated by an optical spectroscopy method. The spectral analysis is performed in the vacuum ultraviolet 50-130 nm spectral regions. The absolute value of the fragmentation cross-section in the dissociative ionization and excitation processes is determined. Measurements are performed in the electron energy range 25-120eV for ionization and 200-500eV for excitation processes respectively