Collisions of Aluminum and Iron Ions and Atoms with Gases in the Energy Range 5 KeV-2.5 MeV

Abstract

Electron capture, electron loss, and ionization have been studied for aluminum and iron ions and atoms passing through N2, O2, and Ar. The experiments, which took place in three separate laboratories, had available the energy range from 5 keV to 2.5 MeV. In addition to presenting the cross sections and the methods employed, the paper contrasts the effects of projectile particles having low first and second ionization potentials with those of the more usually studied projectiles having ionization potentials comparable with those of the target gas. Of particular interest is the comparison of charge-transfer-versus ion-stripping probabilities. The results are compared with some of the present approximate theories.

New Uses for Low-Energy Accelerators

“…However~smaller sublimation sources (where the solid material is heated to a temperature at which its vapor pressure is approximately 1 f-L and where the vapor is then ionized by electron impact) have been described in the literature for lithium bealns, (57) for Al+, Zn+, Cu+, Ag+, and Fe+ beams, (58) and for U+, Sr+, Ba+, Te+, and Be+ beams. (59) After analysis by a magnetic or eIe:trostatic analyzer to insure a mono-energetic beam of the proper ion species (the actual choice of beam energy depends very much on the problem under attack, i.e. the ionization state of interest and also the individual transition of interest, since in many cases there is a marked dependence of the relative line intensities on the particle energy(60,61»), the beam is traditionally passed through a thin beryllium or carbon foil (10 to 20 f-Lg/cm 2 ).…”