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Table 6:

The lowest $\Delta n_{{\rm c}} = 0$ core excitation thresholds (in Rydbergs) for Co X and Ni XI. Uncertainties are enclosed in lower parentheses.
    ${\rm Co}^{9+}$   ${\rm Ni}^{10+}$
K Config. Level(mix) Presenta NISTb MCHFc   Level(mix) Presenta NISTb MCHFc FAC3e CIV3f

1 $\rm 3s^{2}3p^{6} $ $\rm {}^{1}\hspace*{-.5mm}S_{0}~(97.0\%) $ 0.00000 0.00000 0.00000   $\rm {}^{1}\hspace*{-.5mm}S_{0}~(97.1\%) $ 0.00000 0.00000 0.00000 0.0000 0.00000
2 $\rm 3s^{2}3p^{5}3d$ $\rm {}^{3}\hspace*{-.5mm}P_{0}^{{\rm o}}~(97.5\%)$ 3.97623 3.999(30)$^{\dag }$ 3.70893   $\rm {}^{3}\hspace*{-.5mm}P_{0}^{{\rm o}}~(97.6\%)$ 4.27882 4.27667 3.95697 4.2998 4.34736
3 $\rm 3s^{2}3p^{5}3d$ $\rm {}^{3}\hspace*{-.5mm}P_{1}^{{\rm o}}~(96.9\%)$ 4.00373 4.026(28)$^{\dag }$ 3.73778   $\rm {}^{3}\hspace*{-.5mm}P_{1}^{{\rm o}}~(96.8\%)$ 4.31288 4.31002 3.99197 4.3349 4.38366
4 $\rm 3s^{2}3p^{5}3d$ $\rm {}^{3}\hspace*{-.5mm}P_{2}^{{\rm o}}~(95.8\%)$ 4.06022 4.084(21)$^{\dag }$ 3.79773   $\rm {}^{3}\hspace*{-.5mm}P_{2}^{{\rm o}}~(95.2\%)$ 4.38307 4.38274 4.06469 4.4086 4.45723
5 $\rm 3s^{2}3p^{5}3d$ $\rm {}^{3}\hspace*{-.5mm}F_{4}^{{\rm o}}~(97.7\%)$ 4.20594 4.199(31)$^{\dag }$ 3.91676   $\rm {}^{3}\hspace*{-.5mm}F_{4}^{{\rm o}}~(97.8\%)$ 4.52944 4.49482 4.18448 4.5391 4.64639
6 $\rm 3s^{2}3p^{5}3d$ $\rm {}^{3}\hspace*{-.5mm}F_{3}^{{\rm o}}~(92.8\%)$ 4.22715 4.235(31)$^{\dag }$ 3.94997   $\rm {}^{3}\hspace*{-.5mm}F_{3}^{{\rm o}}~(91.3\%)$ 4.55153 4.53374 4.22023 4.5785 4.68656
7 $\rm 3s^{2}3p^{5}3d$ $\rm {}^{3}\hspace*{-.5mm}F_{2}^{{\rm o}}~(93.2\%)$ 4.26350 4.283(25)$^{\dag }$ 3.99798   $\rm {}^{3}\hspace*{-.5mm}F_{2}^{{\rm o}}~(91.3\%)$ 4.59721 4.59342 4.27778 4.6393 4.73636
8 $\rm 3s^{2}3p^{5}3d$ $\rm {}^{3}\hspace*{-.5mm}D_{3}^{{\rm o}}~(62.3\%)$ 4.50743 4.494(38)$^{\dag }$ 4.21215   $\rm {}^{3}\hspace*{-.5mm}D_{3}^{{\rm o}}~(60.3\%)$ 4.84888 4.80666 4.49868 4.8593 4.93579
9 $\rm 3s^{2}3p^{5}3d$ $\rm {}^{1}\hspace*{-.5mm}D_{2}^{{\rm o}}~(60.5\%)$ 4.50846 4.511(29)$^{\dag }$ 4.22855   $\rm {}^{1}\hspace*{-.5mm}D_{2}^{{\rm o}}~(58.8\%)$ 4.85545 4.83728 4.52643 4.8953 4.97061
10 $\rm 3s^{2}3p^{5}3d$ $\rm {}^{3}\hspace*{-.5mm}D_{1}^{{\rm o}}~(96.7\%)$ 4.53943 4.53611 4.26634   $\rm {}^{3}\hspace*{-.5mm}D_{1}^{{\rm o}}~(96.5\%)$ 4.88993 4.87373 4.56612 4.9290 5.02599
11 $\rm 3s^{2}3p^{5}3d$ $\rm {}^{3}\hspace*{-.5mm}D_{2}^{{\rm o}}~(61.4\%)$ 4.56821 4.573(24)$^{\dag }$ 4.29382   $\rm {}^{3}\hspace*{-.5mm}D_{2}^{{\rm o}}~(60.2\%)$ 4.92948 4.91337 4.60454 4.9687 5.04846
12 $\rm 3s^{2}3p^{5}3d$ $\rm {}^{1}\hspace*{-.5mm}F_{3}^{{\rm o}}~(59.0\%)$ 4.58588 4.606(25)$^{\dag }$ 4.32726   $\rm {}^{1}\hspace*{-.5mm}F_{3}^{{\rm o}}~(56.1\%)$ 4.94891 4.95018 4.64195 5.0024 5.12673
13 $\rm 3s^{2}3p^{5}3d$ $\rm {}^{1}\hspace*{-.5mm}P_{1}^{{\rm o}}~(96.1\%)$$^{\bigstar}$ 5.73579 5.73579 5.51933   $\rm {}^{1}\hspace*{-.5mm}P_{1}^{{\rm o}}~(96.2\%)$$^{\bigstar}$ 6.14044 6.14158 5.88618 6.2574 6.41884
          $5.5952^{{\rm d}}$         $5.9728^{{\rm d}}$    
14 $\rm 3s^{ }3p^{6}3d$ $\rm {}^{3}\hspace*{-.5mm}D_{1}~(74.2\%) $ 7.21441 7.178(23)$^{\dag }$ 7.01984   $\rm {}^{3}\hspace*{-.5mm}D_{1}~(75.1\%) $ 7.76928 7.720(31)$^{\dag }$ 7.53153 7.7562 7.85347
15 $\rm 3s^{ }3p^{6}3d$ $\rm {}^{3}\hspace*{-.5mm}D_{2}~(74.0\%) $ 7.22694 7.186(31)$^{\dag }$ 7.02926   $\rm {}^{3}\hspace*{-.5mm}D_{2}~(74.1\%) $ 7.78502 7.730(32)$^{\dag }$ 7.54354 7.7687 7.86852
16 $\rm 3s^{ }3p^{6}3d$ $\rm {}^{3}\hspace*{-.5mm}D_{3}~(74.4\%) $ 7.24842 7.198(31)$^{\dag }$ 7.04436   $\rm {}^{3}\hspace*{-.5mm}D_{3}~(75.3\%) $ 7.81290 7.740(33)$^{\dag }$ 7.56317 7.7904 7.89090
17 $\rm 3s^{ }3p^{6}3d$ $\rm {}^{1}\hspace*{-.5mm}D_{2}~(68.8\%) $ 7.46032 7.410(33)$^{\dag }$ 7.29060   $\rm {}^{1}\hspace*{-.5mm}D_{2}~(69.7\%) $ 8.03277 7.970(34)$^{\dag }$ 7.81976 7.9965 9.00447

Notes. (a) present work: 2894-level MCBP results; (b) critically compiled experimental data of Shirai et al. (2000); (c) MCHF results of Froese-Fischer & Tachiev (2006); $^{(\dag )}$ extrapolated along the isoelectronic sequence; $^{(\bigstar)}$ dominant excitation threshold - see Table 2; (d) single-configuration TDCHF results of Ghosh & Mukherjee (1997); (e) 6164-level FAC results of Aggarwal & Keenan (2008); (f) restricted CIV3 results of Verma et al. (2007).


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