Mr. Tarbutt et al., X-ray spectroscopic intercomparison between hydrogenic ions of different Zas a method for determining Lamb shifts, HYPER INTER, 127(1-4), 2000, pp. 333-337
Novel methods for determining the 1s Lamb shift of hydrogenic ions are outl
ined. In one method the energy of a 2-1 transition in the hydrogenic ion of
nuclear charge Z is compared to a 4-2 transition in the hydrogenic ion of
charge 2Z. A second method exploits close coincidences between Lyman series
transitions in ions of similar Z.