Multiply Charged Ions, Excitation and Ionization by Electron Impact.
Abstract
A crossed-beam study of the electron impact excitation and ionization of N(+4) is described. A beam of N(+4) ions with MeV energy is produced in a Van de Graaff accelerator coupled with a gas stripper and separated from other charge states by magnetic and electrostatic analysis. The ion beam is crossed with a variable energy electron beam in a well-defined geometry. Radiation from the excited ions is observed with a photomultiplier downstream from the interaction region. The ions promoted to higher charge states are separated from the primary beam electrostatically and detected with a silicon surface-barrier detector. Chopping of both ion and electron beams is employed. Results are presented for the N(+4) transition at 1240 A in the collision energy range 130 - 400 eV. Substantial reduction in the N(+5) background was achieved but variations in this background precluded measurement of the ionization cross section of N(+4).
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 10, 1974
- Accession Number
- ADA002250
Entities
People
- B. Mass
- R. N. Bradbury
- T. E. Sharp
Organizations
- Lockheed Martin Missiles and Space