Ionization scaling law for high energy ion-aligned elliptic Rydberg hydrogen collisions

The classical trajectory Monte Carlo method was used to calculate electron ionization cross sections involving fully stripped ions of He, C, Ar and Kr colliding with an aligned elliptic Rydberg hydrogen atom for various excited n states. Cross sections from target eccentricities of -0.9 to 0.9 over the energy range 1.21 keV/u to 64 keV/u were used to develop a high energy ionization scaling law as a function of reduced collision speed, initial n state, projectile charge, and eccentricity. The proposed scaling law accurately predicts all theoretical CTMC cross section values for reduced collisions speeds larger than 2.5q.