Proton scattering from excited states of atomic hydrogen
Abstract
© 2018 IOP Publishing Ltd. Wavepacket continuumdiscretisation approach is used to calculate excitation, ionization and electroncapture (ec) cross sections for proton collisions with n = 2 states of atomic hydrogen, where n is the principal quantum number. The approach assumes a classical motion for the projectile and is based on the solution of the threebody Schrödinger equation using the twocenter expansion of the total scattering wave function. The scattering wave function is expanded in an orthonormal basis set built from negativeenergy eigenstates and wavepacket pseudostates representing the continuum of both the target atom and the atom formed by the projectile after capturing the electron. With a sufficiently large basis, due to the strong coupling between channels, the method produces converged cross sections for directscattering, ionization and ec processes simultaneously. For the quasielastic transitions, where both orbital and magnetic quantum numbers change, the integrated cross section is infinite. Nevertheless, the corresponding transitions probabilities are finite at any given impact parameter, indicating that the angular differential cross sections can be measured. Calculated cross sections for scattering on the metastable 2s state are compared with other theoretical results obtained using atomicorbital closecoupling and classicaltrajectory Monte Carlo approaches. Considerable disagreement with previous calculations has been found for some transitions at various incident energies.
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