Isotope Shift of He2P

Abstract
The isotope shift of the deepest P3 and P1 levels of the helium atom is calculated by making use of the wave functions which were reported by one of the authors. The theoretical values of the specific isotope shift of the P3 and P1 levels are -636.00×103 cm1 and 453.83×103 cm1, respectively, which are in fairly good agreement with the observed values (-642±5)×103 cm1 (2P3) and (461±5)×103 cm1 (2P1).

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