SINGLE-ELECTRON CAPTURE IN LOW-ENERGY AR6-HE COLLISIONS()

Double differential cross sections for state-selective single-electron capture processes in Ar6+-He collisions have been measured at laborat ory energies between 75 and 900 eV and scattering angles between 0 and 8 degrees. At the lowest energy, the zero-angle spectrum shows captur e into Ar5+(4p) to be the most important channel. However,as the scatt ering angle is increased, a second peak appears at angles greater than or equal to 2 degrees and becomes more pronounced relative to the 4p capture channel. The energy spectra are interpreted qualitatively in t erms of the reaction windows, which are calculated using the single-cr ossing Landau-Zener model Total and differential cross sections are al so measured and compared with available measurements and calculations.