Table 9: Some relevant energy levels and ionization potentials (in eV) from our MCDF calculations and from NIST (1999) for C-like ions. The energy of each term is obtained as the mean of the energy levels weighted statistically.
N³⁺ O⁴⁺

Level MCDF NIST MCDF NIST

2s²2p² ³P 0 0 0 0

2s²2p² ¹D 3.36 3.13 4.16 3.76

2s²2p² ¹S 6.85 6.64 8.18 7.92

2s2p³ ⁵S 8.33 9.20 10.15 10.96

$E_{\rm IP}$ (2s²2p ²P) 86.38 87.14 125.44 126.22

$E_{\rm IP}$ (2s2p² ⁴P) 96.50 97.82 137.15 138.72

$E_{\rm IP}$ (2s2p² ²D) 105.89 106.09 148.25 148.41

$E_{\rm IP}$ (2s2p² ²S) 111.08 111.64 154.54 154.84

$E_{\rm IP}$ (2s2p² ²P) 114.29 113.82 157.87 157.22

**Table 9:** Some relevant energy levels and ionization potentials (in eV) from our MCDF calculations and from NIST (1999) for C-like ions. The energy of each term is obtained as the mean of the energy levels weighted statistically.
	N³⁺	O⁴⁺
Level	MCDF	NIST	MCDF	NIST
2s²2p² ³P	0	0	0	0
2s²2p² ¹D	3.36	3.13	4.16	3.76
2s²2p² ¹S	6.85	6.64	8.18	7.92
2s2p³ ⁵S	8.33	9.20	10.15	10.96
$E_{\rm IP}$ (2s²2p ²P)	86.38	87.14	125.44	126.22
$E_{\rm IP}$ (2s2p² ⁴P)	96.50	97.82	137.15	138.72
$E_{\rm IP}$ (2s2p² ²D)	105.89	106.09	148.25	148.41
$E_{\rm IP}$ (2s2p² ²S)	111.08	111.64	154.54	154.84
$E_{\rm IP}$ (2s2p² ²P)	114.29	113.82	157.87	157.22

Source LaTeX | All tables | In the text

	1 Introduction
	2 Experimental
	3 MCDF calculations
	4 Results
	5 Concluding remarks
	References