Table 6: Some relevant energy levels and ionization potentials (in eV) from our MCDF calculations and from NIST (1999) for Be-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

2s² ¹S 0 0 0 0

2s2p² ³P 8.43 8.35 10.27 10.19

$E_{\rm IP}$ (2s ²S) 77.13 77.47 113.54 113.90

$E_{\rm IP}$ (2s2p ²P) 87.47 125.65 125.88

**Table 6:** Some relevant energy levels and ionization potentials (in eV) from our MCDF calculations and from NIST (1999) for Be-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
2s² ¹S	0	0	0	0
2s2p² ³P	8.43	8.35	10.27	10.19
$E_{\rm IP}$ (2s ²S)	77.13	77.47	113.54	113.90
$E_{\rm IP}$ (2s2p ²P)		87.47	125.65	125.88

Source LaTeX | All tables | In the text

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