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Table 1

Energies in cm-1 for levels in Fe XXI.

No. Configuration L S J E(RCI) E(RCI2) E(RMBPT) E(FAC) E(NIST) E(CHI)
1 2s(2).2p(2)3P2 0 0 0 0 0 0
2 2s(2).2p(2)3P2 73 864 73 820 73 867 73 041 73 851 73 851
3 2s(2).2p(2)3P2 117 417 117 364 117 372 117 146 117 354 117 367
4 2s(2).2p(2)1D2 244 751 244 667 244 581 245 710 244 561 244 568
5 2s(2).2p(2)1S0 372 137 372 052 372 261 373 060 371 980 371 744
6 2s_2S.2p(3)4S3 486 584 486 521 487 683 479 658 486 950 486 991
7 2s_2S.2p(3)2D3 776 775 776 751 777 005 779 724 776 690 776 685
8 2s_2S.2p(3)2D3 777 404 777 371 777 655 779 963 777 340 777 367
9 2s_2S.2p(3)2D3 803 618 803 562 803 869 805 768 803 540 803 553
10 2s_2S.2p(3)2P1 916 444 916 402 916 773 920 272 916 330 916 333
11 2s_2S.12p(3)2P1 925 074 925 024 925 408 928 822 924 920 924 920
12 2s_2S.2p(3)2P1 942 621 942 556 942 986 946 135 942 430 942 364
13 2s_2S.2p(3)4S3 1 096 019 1 096 012 1 095 820 1 105 578 1 095 670 1 095 679
14 2s_2S.2p(3)2D3 1 127 672 1 127 631 1 127 460 1 137 533 1 127 240 1 127 250
15 2s_2S.2p(3)2P1 1 261 577 1 261 529 1 261 240 1 272 627 1 261 140 1 260 902
16 2p(4)3P2 1 646 437 1 646 462 1 646 467 1 657 411 1 646 300 1 646 409
17 2p(4)3P2 1 735 823 1 735 831 1 735 813 1 747 301 1 735 700 1 735 715
18 2p(4)3P2 1 740 623 1 740 606 1 740 707 1 750 848 1 740 500 1 740 453
19 2p(4)1D2 1 817 786 1 817 776 1 817 362 1 832 102 1 817 100 1 817 041
20 2p(4)1S0 2 048 512 2 048 489 2 047 850 2 066 463 2 048 200 2 048 056
21 2s(2).2p_2P.3s 7 663 283 7 664 054 7 654 119
22 2s(2).2p_2P.3s 7 671 971 7 672 703 7 663 398 7 661 883
23 2s(2).2p_2P.3s 7 780 298 7 781 147 7 770 895
24 2s(2).2p_2P.3s 7 803 764 7 804 419 7 796 397
25 2s(2).2p_2P.3p 7 841 903 7 842 922 7 834 847
26 2s(2).2p_2P.3p: 1 7 898 154 7 898 974 7 891 978
27 2s(2).2p_2P.3p 7 901 553 7 902 378 7 895 497
28 2s(2).2p_2P.3p 7 914 849 7 915 811 7 909 434 7 915 463
29 2s(2).2p_2P.3p: 2 7 983 446 7 984 350 7 977 011
30 2s(2).2p_2P.3p 7 994 588 7 995 388 7 987 318
31 2s(2).2p_2P.3p 8 004 987 8 005 793 7 998 341
32 2s(2).2p_2P.3p 8 007 326 8 008 319 8 002 052
33 2s(2).2p_2P.3p 8 068 537 8 069 071 8 065 382
34 2s(2).2p_2P.3d 8 078 540 8 079 119 8 072 911 8 074 160
35 2s_2S.2p(2)3P2_4P.3s 8 080 551 8 082 001 8 070 805
36 2s(2).2p_2P.3d 8 116 048 8 116 480 8 111 336 8 101 400 8 118 008
37 2s(2).2p_2P.3d: 1 8 121 922 8 122 529 8 118 025 8 124 085
38 2s(2).2p_2P.3p 8 128 645 8 129 396 8 126 192 8 143 710
39 2s_2S.2p(2)3P2_4P.3s 8 131 973 8 133 460 8 121 258
40 2s(2).2p_2P.3d 8 139 290 8 140 735 8 135 992 8 140 000 8 141 785
41 2s_2S.2p(2)3P2_4P.3s 8 181 331 8 182 599 8 170 876
42 2s_2S.2p(2)3P2_4P.3s 8 182 172 8 182 844 8 179 292 8 180 254
43 2s(2).2p_2P.3d 8 202 073 8 202 670 8 195 771
44 2s(2).2p_2P.3d 8 208 705 8 209 597 8 204 329
45 2s_2S.2p(2)3P2_4P.3s 8 222 156 8 222 948 8 217 390
46 2s(2).2p_2P.3d 8 230 918 8 231 868 8 227 144 (8 195 000) 8 229 642
47 2s(2).2p_2P.3d: 2 8 245 453 8 246 428 8 241 436 8 230 900 8 229 642
48 2s(2).2p_2P.3d 8 245 737 8 247 075 8 241 557
49 2s(2).2p_2P.3d 8 247 732 8 249 164 8 243 033
50 2s_2S.2p(2)3P2_4P.3p 8 267 963 8 269 220 8 259 742
51 2s_2S.2p(2)3P2_4P.3p 8 270 558 8 272 088 8 262 373
52 2s_2S.2p(2)3P2_4P.3s 8 274 704 8 275 427 8 270 235
53 2s(2).2p_2P.3d 8 300 618 8 301 128 8 301 379 8 313 600
54 2s(2).2p_2P.3d 8 303 730 8 307 428 8 305 376 8 293 900 8 293 791
55 2s_2S.2p(2)3P2_4P.3p 8 305 917 8 309 162 8 297 457
56 2s_2S.2p(2)3P2_4P.3p 8 312 499 8 309 359 8 300 070
57 2s_2S.2p(2)3P2_4P.3p 8 349 456 8 350 857 8 342 324 8 350 731
58 2s_2S.2p(2)3P2_4P.3p 8 351 775 8 353 277 8 342 522
59 2s_2S.2p(2)3P2_4P.3p 8 352 117 8 353 731 8 343 801
60 2s_2S.2p(2)3P2_4P.3p 8 379 967 8 380 890 8 373 689 8 376 741
61 2s_2S.2p(2)3P2_4P.3p 8 388 634 8 390 292 8 380 281
62 2s_2S.2p(2)3P2_4P.3p 8 399 557 8 401 039 8 390 478
63 2s_2S.2p(2)3P2_4P.3p 8 410 077 8 411 182 8 404 386
64 2s_2S.2p(2)1D2_2D.3s 8 420 588 8 421 426 8 420 569
65 2s_2S.2p(2)1D2_2D.3s 8 428 405 8 429 248 8 428 172
66 2s_2S.2p(2)1D2_2D.3s 8 440 926 8 441 758 8 437 725
67 2s_2S.2p(2)3P2_4P.3p 8 442 813 8 443 776 8 438 241
68 2s_2S.2p(2)3P2_4P.3p 8 443 646 8 445 037 8 440 027
69 2s_2S.2p(2)3P2_4P.3p 8 462 365 8 463 510 8 456 502
70 2s_2S.2p(2)3P2_4P.3p 8 467 690 8 468 680 8 462 413
71 2s_2S.2p(2)3P2_4P.3p 8 470 871 8 471 913 8 466 158
72 2s_2S.2p(2)3P2_4P.3d 8 480 620 8 481 735 8 471 575
73 2s_2S.2p(2)3P2_4P.3d 8 488 782 8 489 971 8 479 898 8 486 331
74 2s_2S.2p(2)1D2_2D.3s 8 496 990 8 497 512 8 498 660
75 2s_2S.2p(2)3P2_4P.3d: 1 8 506 111 8 507 343 8 497 311 8 511 385
76 2s_2S.2p(2)3P2_4P.3d 8 544 575 8 545 928 8 534 831
77 2s_2S.2p(2)3P2_2P.3s 8 545 485 8 546 507 8 544 603
78 2s_2S.2p(2)3P2_2P.3s 8 553 885 8 554 716 8 545 420
79 2s_2S.2p(2)3P2_4P.3d 8 554 798 8 555 918 8 546 365
80 2s_2S.2p(2)3P2_4P.3d 8 555 297 8 556 534 8 547 553
81 2s_2S.2p(2)3P2_4P.3d 8 555 491 8 556 850 8 558 611
82 2s_2S.2p(2)3P2_4P.3d: 2 8 561 662 8 562 969 8 552 789 8 564 535
83 2s_2S.2p(2)3P2_4P.3d 8 581 274 8 582 755 8 576 965 8 575 780
84 2s_2S.2p(2)3P2_4P.3d 8 586 636 8 588 014 8 577 151
85 2s_2S.2p(2)3P2_4P.3d 8 597 735 8 599 106 8 588 388
86 2s_2S.2p(2)1D2_2D.3p 8 606 110 8 606 654 8 607 148 8 605 427
87 2s_2S.2p(2)3P2_4P.3d 8 611 432 8 611 843 8 608 283
88 2s_2S.2p(2)3P2_4P.3d 8 619 312 8 620 847 8 611 148
89 2s_2S.2p(2)3P2_4P.3d 8 632 848 8 634 110 8 624 940
90 2s_2S.2p(2)3P2_4P.3d 8 632 999 8 634 772 8 627 264
91 2s_2S.2p(2)1D2_2D.3p 8 638 806 8 639 402 8 631 484
92 2s_2S.2p(2)3P2_4P.3d 8 639 310 8 641 331 8 638 556
93 2s_2S.2p(2)3P2_4P.3d 8 642 246 8 642 997 8 640 596
94 2s_2S.2p(2)1D2_2D.3p 8 643 164 8 643 819 8 646 413
95 2s_2S.2p(2)1D2_2D.3p 8 652 079 8 652 729 8 654 122
96 2s_2S.2p(2)1S0_2S.3s 8 663 369 8 664 211 8 659 197
97 2s_2S.2p(2)1D2_2D.3p 8 663 995 8 664 698 8 664 020
98 2s_2S.2p(2)3P2_4P.3d 8 664 775 8 665 901 8 664 971
99 2s_2S.2p(2)1D2_2D.3p 8 669 654 8 670 271 8 672 736
100 2s_2S.2p(2)1D2_2D.3p 8 670 238 8 670 921 8 672 774
101 2s_2S.2p(2)3P2_2P.3s 8 678 997 8 679 792 8 684 415
102 2s_2S.2p(2)1D2_2D.3p 8 685 508 8 686 110 8 686 672
103 2s_2S.2p(2)1D2_2D.3p 8 685 523 8 686 131 8 688 610
104 2s_2S.2p(2)3P2_4P.3d 8 690 038 8 691 035 8 688 710
105 2s_2S.2p(2)1D2_2D.3p 8 692 158 8 692 888 8 696 102
106 2s_2S.2p(2)3P2_2P.3s 8 694 748 8 695 448 8 701 378
107 2s_2S.2p(2)1S0_2S.3s 8 705 045 8 705 638 8 705 163
108 2s_2S.2p(2)1D2_2D.3p 8 705 336 8 705 907 8 708 601
109 2s_2S.2p(2)3P2_4P.3d 8 714 259 8 714 891 8 711 939
110 2s_2S.2p(2)3P2_4P.3d 8 718 488 8 719 284 8 716 830
111 2s_2S.2p(2)3P2_4P.3d 8 725 014 8 726 150 8 723 610
112 2s_2S.2p(2)1D2_2D.3p 8 725 573 8 726 160 8 728 210
113 2s_2S.2p(2)3P2_2P.3p: 1 8 728 201 8 729 097 8 733 912
114 2s_2S.2p(2)3P2_2P.3p 8 756 568 8 757 564 8 762 768
115 2s_2S.2p(2)3P2_2P.3p 8 777 614 8 778 384 8 783 967
116 2s_2S.2p(2)3P2_2P.3p 8 783 041 8 783 833 8 788 773
117 2s_2S.2p(2)1D2_2D.3d 8 832 111 8 832 017 8 834 209
118 2s_2S.2p(2)1D2_2D.3d 8 844 277 8 844 450 8 846 181
119 2s_2S.2p(2)3P2_2P.3p 8 849 765 8 850 725 8 853 967
120 2s_2S.2p(2)1D2_2D.3d 8 854 340 8 854 613 8 859 499
121 2s_2S.2p(2)1D2_2D.3d 8 860 935 8 861 284 8 861 717
122 2s_2S.2p(2)1D2_2D.3d 8 861 653 8 861 961 8 866 368
123 2s_2S.2p(2)1D2_2D.3d 8 867 340 8 868 074 8 868 505
124 2s_2S.2p(2)1D2_2D.3d 8 870 509 8 870 881 8 874 759
125 2s_2S.2p(2)1D2_2D.3d 8 874 519 8 875 243 8 875 571
126 2s_2S.2p(2)1S0_2S.3p 8 875 791 8 876 936 8 879 570
127 2s_2S.2p(2)1D2_2D.3d 8 881 012 8 881 744 8 882 290
128 2s_2S.2p(2)3P2_2P.3p 8 883 090 8 883 727 8 887 411
129 2s_2S.2p(2)1S0_2S.3p 8 884 371 8 885 290 8 890 659
130 2s_2S.2p(2)3P2_2P.3p 8 888 846 8 890 045 8 896 515
131 2s_2S.2p(2)3P2_2P.3p 8 892 966 8 893 680 8 902 114
132 2s_2S.2p(2)3P2_2P.3p: 2 8 896 523 8 897 266 8 902 518
133 2s_2S.2p(2)1D2_2D.3d 8 903 035 8 903 384 8 905 859
134 2s_2S.2p(2)1D2_2D.3d 8 903 428 8 904 177 8 908 798
135 2s_2S.2p(2)1S0_2S.3p 8 905 733 8 906 288 8 909 327
136 2s_2S.2p(2)1D2_2D.3d 8 906 644 8 907 399 8 911 686
137 2s_2S.2p(2)1D2_2D.3d 8 911 313 8 912 031 8 916 517
138 2s_2S.2p(2)1D2_2D.3d 8 911 976 8 912 032 8 917 135
139 2s_2S.2p(2)1D2_2D.3d: 1 8 924 212 8 924 801 8 927 900
140 2s_2S.2p(2)1D2_2D.3d 8 944 182 8 944 873 8 949 206
141 2s_2S.2p(2)1D2_2D.3d: 2 8 945 210 8 945 467 8 950 456
142 2s_2S.2p(2)3P2_2P.3p 8 947 674 8 955 676 8 958 083
143 2p(3)4S3_4S.3s 8 964 946 8 958 640 8 967 005
144 2s_2S.2p(2)3P2_2P.3d 8 971 800 8 972 589 8 980 290 8 970 720
145 2s_2S.2p(2)3P2_2P.3d 8 978 976 8 979 625 8 986 183
146 2s_2S.2p(2)1D2_2D.3d 8 983 455 8 983 562 8 989 669
147 2s_2S.2p(2)1D2_2D.3d 8 984 222 8 985 020 8 992 861
148 2s_2S.2p(2)3P2_2P.3p 8 992 824 8 993 171 9 005 735
149 2s_2S.2p(2)3P2_2P.3d: 1 8 998 400 8 998 896 9 005 594 9 001 042
150 2p(3)4S3_4S.3s 9 059 790 9 059 933 9 070 201
151 2s_2S.2p(2)3P2_2P.3d 9 082 726 9 083 034 9 088 799
152 2s_2S.2p(2)1S0_2S.3d 9 084 860 9 085 475 9 091 534
153 2s_2S.2p(2)3P2_2P.3d 9 093 578 9 094 667 9 099 804
154 2s_2S.2p(2)1S0_2S.3d 9 098 970 9 100 004 9 105 207
155 2s_2S.2p(2)3P2_2P.3d 9 106 721 9 107 207 9 116 145
156 2s_2S.2p(2)3P2_2P.3d 9 114 500 9 115 490 9 122 411
157 2s_2S.2p(2)3P2_2P.3d 9 119 916 9 120 705 9 125 948
158 2s_2S.2p(2)3P2_2P.3d: 2 9 123 741 9 126 280 9 132 939
159 2p(3)2D3_2D.3s 9 129 452 9 130 111 9 140 913
160 2p(3)2D3_2D.3s 9 131 559 9 132 121 9 142 407
161 2p(3)4S3_4S.3p: 1 9 139 236 9 140 248 9 142 862
162 2s_2S.2p(2)3P2_2P.3d 9 139 246 9 142 678 9 151 409
163 2p(3)4S3_4S.3p: 2 9 145 963 9 144 693 9 152 433
164 2p(3)4S3_4S.3p 9 149 147 9 148 530 9 154 894
165 2p(3)2D3_2D.3s 9 154 233 9 154 936 9 165 349
166 2s_2S.2p(2)3P2_2P.3d 9 154 960 9 155 180 9 170 016
167 2p(3)4S3_4S.3p 9 171 074 9 172 411 9 172 614
168 2p(3)2D3_2D.3s 9 184 102 9 184 397 9 197 442
169 2p(3)4S3_4S.3p 9 204 030 9 205 207 9 209 882
170 2s_2S.2p(2)3P2_2P.3d 9 204 219 9 209 861 9 217 674
171 2p(3)4S3_4S.3p 9 224 440 9 219 886 9 233 574
172 2p(3)4S3_4S.3p 9 232 518 9 233 776 9 236 754
173 2p(3)2D3_2D.3p 9 278 326 9 279 141 9 288 413
174 2p(3)2P1_2P.3s 9 293 415 9 294 251 9 304 899
175 2p(3)2D3_2D.3p 9 297 693 9 298 340 9 309 081
176 2p(3)2P1_2P.3s 9 303 498 9 304 333 9 315 304
177 2p(3)2D3_2D.3p 9 319 246 9 319 700 9 330 821
178 2p(3)2D3_2D.3p 9 319 254 9 319 854 9 331 029
179 2p(3)2D3_2D.3p: 1 9 333 708 9 334 269 9 346 442
180 2p(3)2D3_2D.3p 9 337 471 9 338 237 9 348 127
181 2p(3)2D3_2D.3p: 2 9 351 181 9 351 598 9 356 614
182 2p(3)2P1_2P.3s 9 352 457 9 353 583 9 356 750
183 2p(3)2D3_2D.3p 9 355 158 9 355 697 9 356 882
184 2p(3)4S3_4S.3d 9 355 869 9 357 353 9 356 975
185 2p(3)4S3_4S.3d 9 356 071 9 357 396 9 360 729
186 2p(3)4S3_4S.3d 9 356 195 9 357 436 9 363 198
187 2p(3)4S3_4S.3d 9 356 415 9 357 820 9 363 954
188 2p(3)4S3_4S.3d 9 359 945 9 361 633 9 367 095
189 2p(3)2P1_2P.3s 9 379 329 9 379 836 9 392 002
190 2p(3)2D3_2D.3p 9 394 163 9 394 106 9 411 350
191 2p(3)4S3_4S.3d 9 410 049 9 411 121 9 417 485
192 2p(3)2D3_2D.3p 9 418 717 9 419 066 9 433 409
193 2p(3)2D3_2D.3p 9 422 708 9 422 791 9 440 269
194 2p(3)4S3_4S.3d 9 434 988 9 436 209 9 441 481
195 2p(3)4S3_4S.3d 9 437 060 9 438 131 9 443 398
196 2p(3)2D3_2D.3p 9 461 732 9 461 868 9 479 514
197 2p(3)2P1_2P.3p 9 470 895 9 471 878 9 484 672
198 2p(3)2D3_2D.3d 9 497 550 9 498 115 9 507 519
199 2p(3)2P1_2P.3p 9 506 366 9 506 959 9 518 109
200 2p(3)2D3_2D.3d 9 507 650 9 508 167 9 519 685
201 2p(3)2P1_2P.3p 9 508 148 9 508 851 9 520 796
202 2p(3)2D3_2D.3d 9 513 273 9 513 576 9 525 026
203 2p(3)2D3_2D.3d 9 515 327 9 515 711 9 526 573
204 2p(3)2D3_2D.3d 9 515 887 9 516 467 9 527 127
205 2p(3)2D3_2D.3d 9 531 988 9 532 635 9 543 735
206 2p(3)2D3_2D.3d 9 533 912 9 534 436 9 544 523
207 2p(3)2D3_2D.3d 9 541 912 9 542 243 9 552 779
208 2p(3)2D3_2D.3d 9 542 106 9 542 329 9 554 096
209 2p(3)2P1_2P.3p 9 546 561 9 547 048 9 559 919
210 2p(3)2P1_2P.3p 9 547 870 9 548 695 9 560 721
211 2p(3)2P1_2P.3p 9 548 860 9 549 544 9 565 350
212 2p(3)2P1_2P.3p 9 576 039 9 576 606 9 590 118
213 2p(3)2D3_2D.3d 9 577 779 9 578 557 9 591 580
214 2p(3)2D3_2D.3d 9 580 581 9 581 027 9 593 328
215 2p(3)2P1_2P.3p 9 587 733 9 588 117 9 601 935
216 2p(3)2D3_2D.3d 9 588 298 9 588 716 9 603 784
217 2p(3)2P1_2P.3p 9 593 774 9 593 872 9 608 454
218 2p(3)2D3_2D.3d 9 596 293 9 596 815 9 611 062
219 2p(3)2D3_2D.3d 9 598 161 9 598 622 9 612 881
220 2p(3)2D3_2D.3d 9 601 373 9 601 722 9 614 007
221 2p(3)2D3_2D.3d 9 618 384 9 619 001 9 633 260
222 2p(3)2D3_2D.3d 9 624 366 9 625 059 9 641 011
223 2p(3)2D3_2D.3d 9 646 766 9 646 771 9 665 006
224 2p(3)2P1_2P.3d 9 690 636 9 691 851 9 704 087
225 2p(3)2P1_2P.3d 9 701 916 9 702 517 9 714 718
226 2p(3)2P1_2P.3p 9 718 240 9 717 625 9 736 559
227 2p(3)2P1_2P.3d: 1 9 720 952 9 721 673 9 741 161
228 2p(3)2P1_2P.3d 9 735 480 9 736 111 9 746 771
229 2p(3)2P1_2P.3d 9 740 645 9 742 719 9 754 847
230 2p(3)2P1_2P.3d 9 748 184 9 749 774 9 758 859
231 2p(3)2P1_2P.3d: 2 9 757 890 9 758 107 9 770 963
232 2p(3)2P1_2P.3d 9 765 663 9 766 056 9 781 499
233 2p(3)2P1_2P.3d 9 780 738 9 781 044 9 794 389
234 2p(3)2P1_2P.3d 9 800 368 9 800 742 9 819 206
235 2p(3)2P1_2P.3d 9 800 852 9 801 738 9 819 939
236 2p(3)2P1_2P.3d 9 879 471 9 879 655 9 902 175
237 2s(2).2p_2P.4s 10 368 077 10 362 393
238 2s(2).2p_2P.4s 10 371 121 10 365 585 10 380 000
239 2s(2).2p_2P.4p 10 442 616 10 437 633
240 2s(2).2p_2P.4p 10 466 102 10 460 676
241 2s(2).2p_2P.4p 10 468 322 10 462 978
242 2s(2).2p_2P.4p 10 470 990 10 465 993
243 2s(2).2p_2P.4s 10 485 597 10 479 693
244 2s(2).2p_2P.4s 10 492 966 10 487 317
245 2s(2).2p_2P.4d 10 532 099 10 526 459
246 2s(2).2p_2P.4d: 1 10 548 542 10 542 323 (10 547 000) 10 547 249
247 2s(2).2p_2P.4d 10 549 480 10 543 488 10 548 000 10 548 160
248 2s(2).2p_2P.4d 10 554 447 10 548 345 10 553 000 10 553 955
249 2s(2).2p_2P.4p 10 568 810 10 563 327
250 2s(2).2p_2P.4p 10 574 912 10 569 412 10 664 000
251 2s(2).2p_2P.4p 10 575 111 10 569 433
252 2s(2).2p_2P.4p 10 578 203 10 572 657
253 2s(2).2p_2P.4p 10 597 862
254 2s(2).2p_2P.4p 10 619 563
255 2s(2).2p_2P.4d 10 652 979
256 2s(2).2p_2P.4d 10 653 631 10 675 000
257 2s(2).2p_2P.4d 10 660 593
258 2s(2).2p_2P.4d: 2 10 666 807
259 2s(2).2p_2P.4d 10 666 946 10 688 000
260 2s(2).2p_2P.4d 10 667 948
261 2s(2).2p_2P.4d 10 683 984 10 681 000
262 2s(2).2p_2P.4d 10 687 400

Notes. E(RCI) this work, E(RCI2) previous RCI calculations by Jönsson et al. (2011), E(RMBPT) relativistic many-body pertubation calculations by Gu (2005a), E(FAC) calculations using the Flexible Atomic Code (FAC) by Landi & Gu (2006), E(NIST) NIST recommended values (NIST Atomic Spectra Database 2013) and E(CHI) observed energies from the Chianti database (Landi et al. 2012). Indices “: 1” and “: 2” are used to differ between identical configurations which share the same coupling and leading LS-percentage composition.

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