Collision Processes of Highly Excited Hydrogen Atom. I. Transitions between Degenerate States

抄録

The cross sections for the transitions 5S_1⁄2→5P_1⁄2, 5_1⁄2→5P_3⁄2, 5P_1⁄2→5D_3⁄2, 5S_1⁄2→5D_3⁄2 and 5S_1⁄2→5D_5⁄2 in the hydrogen atom by proton impact are calculated on the basis of the impact parameter method. Distant collisions are dominant and the couplings among the sub-levels belonging to the same n are important at low energies, but the couplings with the levels belonging to different n’s are negligibly small. The Glauber and the Born approximations are also applied to the same problem and the Glauber approximation gives a good agreement with the impact parameter method over a wide energy range down to at least about 100 eV.