Charge Changing Collisions of Atomic Beams in Alkali-Metal Vapors. IV. Total Cross Sections for Single-Electron Capture by H⁺ Ion and H(1s) Atom

Abstract

Total cross sections σ₊₀ and σ₀₋ for single-electron capture by H⁺ ion and H(1s) atom during passage through vapors of Cs, Rb, K and Na have been measured by observing the growth of fast collision products in the projectile energy range 0.4–5.0 keV. The partial cross sections σ_m and σ_g (σ₊₀=σ_m+σ_g), which are the cross sections eventually leading to formation of H(2s) and H(1s), respectively, have also been determined with the aid of the metastable atom fraction f_2s data obtained previously. Each σ_m curve has noticeable structure composed of two humps. The total cross sections σ₊₀ also have, although not noticeable, similar structure, indicating the existence of some secondary interference effects between the charge exchange channel and other inelastic or elastic channel. In the case of Cs target, comparison with other experimental and theoretical data is made.