Relativistic configuration-interaction calculations of energy levels of the $1s^22l$ and $1s2l2l'$ states in lithium-like ions: carbon through chlorine

摘要

We present systematic calculations of energy levels of the $1s^22l$ and$1s2l2l'$ states of ions along the lithium isoelectronic sequence from carbontill chlorine. The calculations are performed by using therelativistic-configuration-interaction method adapted to the treatment ofautoionizing core-excited states. The relativistic energies are supplementedwith the QED energy shifts calculated within the model QED operator approach. Asystematic estimation of the theoretical uncertainties is performed for everyelectronic state and every nuclear charge. The results are in agreement withexisting high-precision theoretical and experimental data for the ground andfirst excited states. For the core-excited states, our theory is much moreaccurate than the presently available measurements.