Table 5: Level indices, experimental and theoretical energy levels, and percentage compositions for the 27 levels of the 3s²3p², 3s3p³ and 3s²3p3d configurations of Fe XIII. Experimental energies are from the NIST database (Martin et al. 1995) except where otherwise stated. The first number in the percentage composition column is the contribution of the identified level. Other contributing levels from the same configuration do not have their configurations identified. Only percentages 5% are listed.

			Energy (cm-1)
Index	Configuration	Term	Expt.	Theory	Percentage composition of levels
1	3s23p2	3P0	0.0	0.0	93.2%
2		3P1	9305.64a	9411.63	96.6%
3		3P2	18566.76a	18722.40	87.7% + 8.9% 1D2
4		1D2	48 068	48 359	87.6% + 8.9% 3P2
5		1S0	91 508	91 753	91.8%
6	3s3p3	5S2	214 624b	214 680	97.9%
7		3D1	287 205	287 237	84.0% + 10.3% 3s23p3d 3D1
8		3D2	287 360	287 401	82.7% + 9.9% 3s23p3d 3D2
9		3D3	290 180b	290 307	88.0% + 10.2% 3s23p3d 3D3
10		3P0	328 925b	329 076	88.8% + 9.2% 3s23p3d 3P0
11		3P1	329 706b	329 797	85.2% + 9.1% 3s23p3d 3P1
12		3P2	330 279	330 411	77.4% + 9.0% 3s23p3d 3P2
13		1D2	362 407b	362 651	52.7% + 38.7% 3s23p3d 1D2
14		3S1	415 462	415 432	75.4% + 18.4% 1P1
15	3s23p3d	3F2	432 741b	432 187	96.0%
16		3F3	439 420b	439 116	96.4%
17	3s3p3	1P1	438 050	438 401	68.2% + 19.6% 3S1 + 8.7% 3s23p3d 1P1
18	3s23p3d	3F4	448 599	449 369	97.1%
19		3P2	486 358	486 456	47.3% + 20.5% 1D2 + 15.5% 3s3p3 1D2 + 7.5% 3D2
20		3P1	494 942	494 260	58.1% + 27.6% 3D1 + 6.2% 3s3p3 3P1
21		1D2	498 870	499 295	34.9% + 22.2% 3P2 + 23.2% 3s3p3 1D2 + 11.0% 3D2
22		3P0	501 520b	500 393	87.2% + 9.2% 3s3p3 3P0
23		3D1	506 502	506 186	57.1% + 28.4% 3P1 + 7.3% 3s3p3 3D1
24		3D3	509 176	509 594	85.2% + 9.8% 3s3p3 3D3
25		3D2	509 250	519 793	67.5% + 17.1% 3P2 + 8.3% 3s3p3 3D2
26		1F3	556 870	557 043	95.4%
27		1P1	570 690	570 847	85.3% + 8.9% 3s3p31P1

a Penn & Kuhn (1994). b Jupén et al. (1993).