Coherence studies of hydrogen atoms formed in proton-hydrogen, - helium charge-transfer collisions

The s-p coherence parameters characterizing excited n=2-4 hydrogen atoms produced in 25-200 keV proton collisions with atomic hydrogen and helium are investigated using the classical trajectory Monte Carlo method. Coherence parameters for the electric dipole moment of the charge distribution z, the Runge-Lenz component z, and the first-order moment of the current distribution z are compared with available experimental data. These same parameters are also evaluated as a function of projectile scattering angle and display large variation's at small angles