Table 2: Comparisons of fine-structure energy levels (in cm-1) for K VIII. CSS: measurement of Churilov et al. (1989); NIST: (http://www.nist.gov); CFF: calculation by Fischer (2002) and BF: calculation by Fawcett (1983). (a) and (b) in the present calculation represents fine-tuned and ab initio energies respectively.
Index Conf. Level NIST CSS Present(a) Present(b) CFF BF Leading$\%$
                   
1 $\rm 3s^2$ $\rm ^1S_0$ 0.0 0.0 0.0 0.0      
2 3s3p $\rm ^3P_0$ 128187 128097 128299.4 126868.1 127726.2 127948 100
3   $\rm ^3P_1$ 129299 129209 129407.4 127888.8 128856.2 129121 100
4   $\rm ^3P_2$ 131672 131582 131781.5 130046.4 131229.9 131607 100
5   $\rm ^1P_1$ 192537 192537 192406.0 195479.7 192274.5 192537 96
6 $3\rm p^2$ $\rm ^1D_2$ 300387 300317 298309.8 299295.0 300376.2 300839 74, 24(14)
7   $\rm ^3P_0$ 304890 304820 304991.1 305242.9 304648.4 304642 99
8   $\rm ^3P_1$ 306249 306179 306358.7 306451.2 306059.5 306064 99
9   $\rm ^3P_2$ 308826 308756 308905.6 308739.2 308656.5 308780 98
10   $\rm ^1S_0$ 357660 357590 357711.7 361404.2 357870.3 357581 93, 3(1)
11 3s3d $\rm ^3D_1$ 368197 368127 368330.2 370132.8 369008.5 368385 100
12   $\rm ^3D_2$ 368276 368206 368409.2 370246.4 369050.1 368546 100
13   $\rm ^3D_3$ 368407 368337 368540.4 370426.2 369208.3 368790 100
14   $\rm ^1D_2$ 419100 419030 421488.0 427516.5 420073.3 419545 74, 24(6)
15 3p3d $\rm ^3F_2$ 503877 503770 504000.4 504139.3 504412.9 503678 97
16   $\rm ^3F_3$ 505277 505184 505404.0 505462.9 505939.8 505268 100
17   $\rm ^3F_4$ 507077 506945 507207.5 507086.5 507788.3 507171 100
18   $\rm ^1D_2$ 510990 510993 511122.8 511537.4 511447.5 510589 97
19   $\rm ^3P_2$ 535417 535330 535515.8 538121.1 535985.9 534935 86, 13(23)
20   $\rm ^3P_1$   536211 536347.1 538937.6 536938.3 535781 82,17(22)
21   $\rm ^3P_0$   537294 537447.5 539782.1 538081.1 536830 99
22   $\rm ^3D_1$   538541 538688.4 541337.9 539239.4 538229 83, 17(20)
23   $\rm ^3D_2$ 538637 539020 538835.7 541848.6 539706.7 538810 86, 13(19)
24   $\rm ^3D_3$ 539257 539175 539390.3 542116.7 539850.4 539102 100
25   $\rm ^1F_3$   576421 576746.9 586240.2 577665.2 584295 98
26   $\rm ^1P_1$ 553620 585520 586085.0 595776.1 586834.8 589192 95, 4(5)
27 $\rm 3d^2$ $\rm ^3F_2$   742660 742805.1 745600.1 744597.8   100
28   $\rm ^3F_3$   742797 742942.4 745783.3 744812.7   100
29   $\rm ^3F_4$   742952 743097.5 746017.3 744957.3   100
30   $\rm ^1G_4$   756866 757192.6 763964.1 759202.4   97
31 $\rm 3d^2$ $\rm ^1D_2$   757420 758019.9 761765.4 759299.4   83, 14(44)
32   $\rm ^3P_0$   762399 762561.3 766306.8 764444.7   99
33   $\rm ^3P_1$   762470 762633.7 766375.2 764562.6   99
34   $\rm ^3P_2$   762534 762701.1 766483.9 764565.9   99
35   $\rm ^1S_0$   803924 804779.4 813990.0 806682.8   92, 4(63)


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