Impact-parameter treatment of hydrogen-hydrogen excitation collisions. III. Electron exchange and nuclear symmetry effects

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Abstract
For Pt. II see abstr. A44297 of 1969. By using a basis set of symmetrized atomic orbitals the influence of electron exchange and nuclear symmetry is examined for the 2s and 2p collisional excitations of hydrogen by a hydrogen atom with impact energy E in the range 0.25<or=E<or=225 keV. These effects reduce all the cross sections and affect the 2s excitation more than the 2p excitation. At high energies, the results tend to the Born values, indicating that the neglect, in this treatment, of the phase factors which account for the translational motion of the atomic electrons, does not cause much error for excitation.

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