A practical method of obtaining compact atomic non-relativistic wavefunctions adapted to the 2nd order calculation of expectation values of mono- and bi-electronic operators is described. Specific isotope shifts are thus calculated: as a test for the method, in He I 1s2p for which the exact values are known; in Mg I or the virtual transition 3s3p 1 P- 3 P.
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J J Labarthe (1973) studied this question.
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