Spectral properties and polarizabilities for fluorine-like ions with Z = 20–30

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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	E_emuCI	ΔE_fullCI	ΔE_NIST	ΔE_Zanna	ΔE_Jonauskas	ΔE_Nahar	ΔE_Si
1	2p⁻¹	²P_3∕2	0	0	0	0	0	0	0
2	2p⁻¹	²P_1∕2	102 506	0	−73	−73	443	−4444	−118
3	2s⁻¹	²S_1∕2	1 076 297	0	11 595	11 697	−3297	1793	11 661
4	2p⁻²3s¹	⁴P_5∕2	6 218 877	−91	−3123	−3123	12 105	−13336	−1576
5	2p⁻²3s¹	²P_3∕2	6 245 240	−89	−2860	−2810	10 413	−14133	−2249
6	2p⁻²3s¹	⁴P_1∕2	6 297 661	−103	−12539	−3539	12 070	−13058	−1860
7	2p⁻²3s¹	⁴P_3∕2	6 315 272	−88	−2628	−2628	11 743	−14574	−1913
8	2p⁻²3s¹	²P_1∕2	6 339 533	−86	−3067	−3067	9912	−15344	−2765
9	2p⁻²3s¹	²D_5∕2	6 399 132	−82	−868	−2068	11 147	−17428	−210
10	2p⁻²3s¹	²D_3∕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). ΔE_x = E_emuCI − E_x. This table is available in its entirety at the CDS.

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