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Table 1

Energy levels (in cm−1) relative to the ground state for the 250 lowest levels of Fe XVIII.

Index Configuration Term EemuCI ΔEfullCI ΔENIST ΔEZanna ΔEJonauskas ΔENahar ΔESi
1 2p−1 2P3∕2 0 0 0 0 0 0 0
2 2p−1 2P1∕2 102 506 0 −73 −73 443 −4444 −118
3 2s−1 2S1∕2 1 076 297 0 11 595 11 697 −3297 1793 11 661
4 2p−23s1 4P5∕2 6 218 877 −91 −3123 −3123 12 105 −13336 −1576
5 2p−23s1 2P3∕2 6 245 240 −89 −2860 −2810 10 413 −14133 −2249
6 2p−23s1 4P1∕2 6 297 661 −103 −12539 −3539 12 070 −13058 −1860
7 2p−23s1 4P3∕2 6 315 272 −88 −2628 −2628 11 743 −14574 −1913
8 2p−23s1 2P1∕2 6 339 533 −86 −3067 −3067 9912 −15344 −2765
9 2p−23s1 2D5∕2 6 399 132 −82 −868 −2068 11 147 −17428 −210
10 2p−23s1 2D3∕2 6 402 771 −86 −1029 −1029 10 887 −17553 −427

Notes. The present energies from Emu CI calculations and full CI calculations are compared with NIST values (Kramida et al. 2019), CHIANTI database (Del Zanna et al. 2015), MCDHF calculations (Jonauskas et al. 2004; Si et al. 2016), and R-matrix calculations (Nahar 2006). ΔEx = EemuCIEx. This table is available in its entirety at the CDS.

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