Experimental Studies of Electron Impact Phenomena: (i) Absolute Elastic Differential Cross Section Measurements of Carbon-Monoxide Nitrogen Molecule, and Carbon-Dioxide Using a Refined Relative Flow Technique, (ii) Differential Cross Section Measurements for Excitation of Electronic Levels of Carbon-Monoxide by Electron Impact, (iii) Absolute Total Scattering Cross Section Measurements for Electron Impact on Krypton, Oxygen Molecule, and Carbon-Monoxide
Absolute elastic differential scattering cross sections (DCS) for electron impact on CO, N_2 , and CO_2 in the energy range 20-100 eV and angular range 20^circ -120^circ were measured. A crossed beam scattering geometry was employed and the results were obtained using a relative flow technique in which the DCS of CO and CO_2 were compared directly to the DCS of helium at each angle and energy and the DCS of N_2 was compared directly to the DCS of CO. The results of the elastic DCS of neon are also presented as a check on the experimental procedure. Differential cross section measurements for excitation of the electronic features (a^3Pi , a^'^3Sigma ^+, d^3Delta, and A^1Pi) of CO by electron impact have been carried out by JPL group (Peter Zetner and Sandor Trajmar). These data have been analyzed and differential cross sections were obtained for the impact energies 12.5 eV and 15.0 eV by using a computer unfolding program that employes flux corrected Franck-Condon factors and calibration scheme developed jointly with the JPL group. Details of the routine for extracting the DCS are presented. Absolute total scattering cross section measurements were carried out for electron impact on Kr, O_2 , and CO. The results were obtained using a linear attenuation technique in the 5-300 eV incident energy range. The present results have an assigned error of 3% and generally found to be in good agreement with other experimental data.
- Pub Date:
- December 1988
- Physics: Molecular