A deep millimeter survey detected 323 H, He I, and He II radio recombination lines toward IC 418 and NGC 7027, including many lines seen for the first time.
Lamb shift of $n = 1$ and $n = 2$ states of hydrogenlike atoms, $1 \le Z \le 110$
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abstract
Theoretical energy levels of the $n = 1$ and $n = 2$ states of hydrogenlike atoms with the nuclear charge numbers $1 \le Z \le 110$ are tabulated. The tabulation is based on ab initio quantum electrodynamical calculations performed to all orders in the nuclear binding strength parameter $Z\alpha$, where $\alpha$ is the fine structure constant. Theoretical errors due to various effects are critically examined and estimated.
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Deep survey of millimeter RRLs towards the planetary nebulae IC 418 and NGC 7027
A deep millimeter survey detected 323 H, He I, and He II radio recombination lines toward IC 418 and NGC 7027, including many lines seen for the first time.