1s2s2p2 5P-1s2p3 5S degrees transition and fine structure of Be-like systems.

Abstract

Using an LSJ-coupling scheme and a configuration-interaction wave function, the relativistic energies, transition wavelengths of the 1s2s2${\mathit{p}}^{2}$ $^{5}$P and 1s2${\mathit{p}}^{3}$ $^{5}$S\ifmmode^\circ\else\textdegree\fi{}, are studied. The relativistic correction, Breit-Pauli operator, and mass polarization correction are calculated for ions from Be i to Ne vii. Very good agreement with experiment is obtained in many cases. For example, the calculated transition wavelengths for Be i, N vi, O v, and Ne vii are 1910.15, 825.45, 694.75, and 526.57 \AA{}B. It is to be compared with the corresponding experimental data of 1909.5\ifmmode\pm\else\textpm\fi{}0.6, 825.55\ifmmode\pm\else\textpm\fi{}0.1, 694.75\ifmmode\pm\else\textpm\fi{}0.1, and 526.65\ifmmode\pm\else\textpm\fi{}0.1 \AA{}. The calculated fine-structure values agree reasonably well with other theoretical results and with experiments. Some interesting comparisons between the existing theoretical data will also be discussed.