Excitation of Atoms by Electron Impact

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  • Nakamura Hiroki
    Department of Applied Physics, Faculty of Engineering, University of Tokyo

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Excitation of atoms by electron impact is investigated theoretically with use of the total angular momentum representation. The mathematical method described in the author’s previous paper is used. The exchange effect is neglected throughout the paper. A new cross-section formula is derived in the two-state approximation. This formula is more accurate than the usual distorted wave (DW) one. In a certain limiting case this coincides with the corresponding B II approximation proposed by Seaton (the Born approximation for the reactance matrix). Furthermore by extending the method to a three-state case some allowance is made for effects of an intermediate state. The new expression for the cross section is again obtained.

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