Abstract
The specific mass shift of the ionisation energy between 20Ne and 22Ne has been calculated using many-body perturbation theory. The first-order expectation value, neglecting relaxation effects is -41.0 GHz. Allowing for relaxation effects changes the result to -16.3 GHz, which, together with a lowest-order correlation effect of 9.3 GHz, gives a total result of -7.0 GHz. The experimental value is (-11 ± 3) GHz and the discrepancy is ascribed to higher-order correlation effects, which have not been evaluated.
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