Some perturbation calculations for 1s2p, 1s 22p,and 1s 22s |
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Authors: | J Killingbeck |
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Institution: | Physics Department , University of Hull , England |
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Abstract: | The Dalgarno interchange theorem is used, together with the U function approach, to evaluate the first order perturbation corrections to <r 1 -1+r 2 -1> and <r 1 + r 2> for the two-electron states 1s2p 1 P and 1s2p 3 P. The results for <r 1 + r 2> are extended by using a screening approximation, and are compared with the results of accurate variational calculations. The first order perturbation correction to spin-weighted expectation values of type <ΣV(rj )szj > is given for the three-electron states 1s 22p 2 P and 1s 22s 2 S. The case V(rj ) = r j -1 is treated in detail. |
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