Abstract
The relative differential partial ionization cross sections for the production of ionic fragments of molecule under impact of 10–20 keV electrons have been measured using an ejected electron-produced ion coincidence technique in a crossed beam apparatus with a time-of-flight analysis of the ions. The detection angle of the ejected electrons of nondiscriminated energies was kept at 90° with respect to the incident electron-beam direction. The 14 ionic fragments: and resulting from the dissociative ionization of the molecule were identified and their relative production cross sections have been measured. The branching ratios of 8 ionic fragments to 5 and to 3) as a function of impact energy have been determined. These ratios are found to have an almost a constant value over the considered impact energy range within the experimental uncertainty of the measurements. For the investigated impact energies, no previous data or theoretical calculations exist for a direct comparison with the present results.
- Received 12 September 2002
DOI:https://doi.org/10.1103/PhysRevA.67.022704
©2003 American Physical Society