THE EXTREME ULTRAVIOLET EMISSION-SPECTRUM OF CO PRODUCED BY ELECTRON-IMPACT AT 20 AND 200 EV

In this first part of a laboratory study of predissociation in CO we have measured the electron-impact-induced fluorescence spectrum of CO in the wavelength range 40-125 nm at a spectral resolution of 0.5 nm. The experiment was performed in a crossed-beam configuration under optically thin conditions. Our spectral measurements at 200 eV electron impact energy provide the emission cross sections of atomic dissociation fragments (C I, C II, O I, O II) and the vibrational transitions of the B (1)SIGMA+, C (1)SIGMA+, E (1)PI-X (1)SIGMA+ band systems of CO. The measured emission cross sections of these molecular transitions will be needed for comparison with excitation cross sections from electron energy-loss spectra to determine predissociation yields.