@article{oai:ir.kagoshima-u.ac.jp:00010661,
 author = {ITOH, Shinichi and 伊藤, 伸一 and NAMEDA, Naoyoshi and 行田, 尚義},
 journal = {鹿児島大学工学部研究報告, The research reports of the Faculty of Engineering, Kagoshima University},
 month = {Sep},
 note = {We obtain the multiplet energies for several rare earth (RE) ions by ab initio molecular orbital calculations including spin-orbit interaction working on 4f electrons of RE. Because of a limitation of the ability of computations, the lower lying multiplet energies for Ce^<3+>, Nd^<3+>, Gd^<3+>, Eu^<3+> and Er^<3+> ions are calculated in this report. For the excitations of 4f electrons, spin multiplicity for 4f^<n>
electrons is not unchangeable (not always　ΔS=0) both in initial and final states by selection rule under spin-orbit interaction. We estimate the possibility of transitions for the multiplet terms for RE ions with use of the obtained electronic spin states in the present case.},
 pages = {195--199},
 title = {Spin Multiplicities of Luminescent Energy Levels for Rare Earth Ions},
 volume = {37},
 year = {1995}
}