Inelastic Collisions between Heavy Particles II: Contributions of Double-Transitions to the Cross Sections associated with the Excitation of Hydrogen Atoms in Fast Encounters with other Hydrogen Atoms

Born's approximation is used to calculate the cross sections of the processes H(1s) + H(1s) → H(2s or 2p) + H(2s, 2p, 3s, 3p, 3d or C) where C represents the continuum. The results are presented mainly in graphical form. It is found that these double-transition collisions are together much more effective at high impact energies than are simple single-transition collisions such as H(1s) + H(1s) → H(2s or 2p) + H(1s).