CRITICAL-REVIEW OF EXPERIMENTAL STUDIES OF THE BE-II CORE-EXCITED LEVEL SYSTEM

All published experimental data on the spectrum of the core-excited te rm system of the Be+ ion are critically compiled and analysed on the b asis of Hartree-Fock calculations and computer-aided spectrum-identifi cation and level-optimization programs. As a result, 49 core-excited t erms in Be II are firmly established. Another 44 terms need further co nfirmation. More than 100 spectral lines belonging to transitions in t he Be II core-excited term system are compiled. Spectral regions 80-10 5 Angstrom and 580-5200 Angstrom are covered 13 new assignments are ma de, and 33 old assignments are changed. 44 previously unobserved spect ral lines are predicted, including 10 intersystem lines. Several exper imental and theoretical problems are outlined.