Total Charge Transfer Cross Sections Research Articles

Dissociative Charge Transfer in He+–O2 and He+–N2 Collisions

The cross sections for charge transfer between He+ ions and molecules of nitrogen and oxygen have been determined within the energy range 100–7700 eV. A mass spectrometer was used to analyze the secondary ions, and the dissociative and nondissociative charge-transfer cross sections were separately determined. The observations show that in both reactions the major contribution to the total charge-transfer cross section comes from collisions involving dissociation.

Charge transfer and ionization by positive ions in the energy range 60 to 450 keV

Charge transfer and ionization by singly charged positive ions have been investigated by means of a variation of the well-known condenser method in which slow charge collection over a precisely determined path length is carried out at pressures low enough to ensure single collision conditions; a uniform axial magnetic field enables total slow ion currents to be measured. The apparent total charge transfer cross-section, the total electron production cross-section and the total slow ion production cross-section have been determined for seventeen cases involving rare gas ions in the rare gases and hydrogen.

Electron Capture Processes for Multiply Charged Ions

Measurements are reported of the total charge transfer cross sections of Kr2+, Kr3+, Kr4+ in Ne, He, for ions accelerated through potential differences of 100-3000 v. These and previous data are interpreted in terms of the pseudocrossing of potential energy curves. On the assumption that for each capture process transitions only occur at a certain nuclear separation Rx, an attempt is made to relate the potential energy curve separation ΔURx at this point with Rx-1.

Charge Transfer Reactions of Doubly Charged Ions

Measurements are reported of the total charge transfer cross sections for Ne, A, Kr, Xe doubly charged ions in their own gas. They are for the processes 20σ02 + ½20σ11. Comparisons are made with experiments and with the quantum theory calculations of Fetisov and Firsov.