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- W2114554920 abstract "An investigation is made of the effects of 2s:2p degeneracy on cross sections for the 1s → 2p and 1s → 2s excitation of hydrogen atoms by electron and proton impact. The initial relative energy ranges considered are 10.2 to 50 eV for electrons and 0.25 to 50 keV for protons. A simple rotating axis approximation of Bates is employed, and the degeneracy is allowed for by using `spheroidal' atomic wave functions in the matrix elements rather than pure 2s for 2p functions. These spheroidal functions are varying linear combinations of 2s and 2p, and are the correct zero-order functions for the atom perturbed by a charged particle. The degeneracy effects are measured by comparing the `direct' cross sections found using the pure 2s and 2p functions with the `indirect' cross sections obtained from the spheroidal functions. The indirect results are quite different from the direct ones for slow collisions, both for electron and for proton impact. Comparisons are made with the Born approximation, with certain more refined results of other authors, and (for electron impact) with the experimental evidence. The indications are that the indirect cross sections are the better for slow collisions, and it is concluded that allowance should certainly be made for degeneracy effects if accurate excitation cross sections are desired." @default.
- W2114554920 created "2016-06-24" @default.
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- W2114554920 date "1963-01-01" @default.
- W2114554920 modified "2023-09-26" @default.
- W2114554920 title "The Effects of Degeneracy on the Inelastic Scattering of Electrons and Protons by Hydrogen Atoms" @default.
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- W2114554920 doi "https://doi.org/10.1088/0370-1328/81/1/305" @default.
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