Abstract
A simple variational calculation, suggested by work on hydrogen atom multipole polarizabilities, is applied to calculate second-order energy shifts E2(l) for the 1s2 configuration. The results for l>or=3 are better than some of those given by much more complicated calculations. Certain first-order expectation values are calculated exactly, and provide a sensitive check on the first-order perturbed wavefunction.
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https://sci-hub.tw/https://iopscience.iop.org/article/10.1088/0022-3700/6/8/014/meta
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