Collisions between H⁺ and H₂ at kilo-electron-volt energies: Absolute differential cross sections for small-angle direct, single-, and double-charge-transfer scattering

R. S. Gao, L. K. Johnson, G. J. Smith, C. L. Hakes, K. A. Smith, N. F. Lane, R. F. Stebbings, and M. Kimura.

Phys. Rev. A 44, 5599 (1991)

Measurements of absolute differential cross sections for H⁺-H₂ direct, single-, and double-charge-transfer scattering at 0.5, 1.5, and 5.0 keV are reported at laboratory scattering angles less than 1° with an angular resolution of approximately 0.02°. The cross sections exhibit deep interference oscillations in single-charge-transfer scattering, but no such oscillations are present in direct and double-charge-transfer scattering. Theoretical cross sections derived using the diatoms-in-molecules method to describe the molecular states in a semiclassical molecular-orbital three-state close-coupling model within a semiclassical framework agree satisfactorily with the experimental results.