Table 2. Core Electron Binding Energies from ΔSCF Calculations Based on Equation 3 and the PBE Functional and from Calculations where a G₀W₀ or G₀W₀Γ Correction Has Been Applied to ϵ_max in Equation 3^a.

Solid	Core level	EB Expt.	EBPBE	Error		Error		Error
Li	Li 1s	54.85	54.64	–0.21	54.54	–0.31	54.71	–0.14
Be	Be 1s	111.85	111.48	–0.37	111.21	–0.64	111.97	0.12
Na	Na 1s	1071.75	1069.68	–2.07	1069.37	–2.38	1069.79	–1.96
Na	Na 2p	30.51	30.58	0.07	30.27	–0.24	30.69	0.18
Mg	Mg 1s	1303.24	1300.89	–2.35	1300.44	–2.80	1301.10	–2.14
Mg	Mg 2p	49.79	49.44	–0.35	48.99	–0.80	49.65	–0.14
Graphite	C 1s	284.41	283.44	–0.97	283.02	–1.39	283.77	–0.64
BeO	Be 1s	110.00	110.44	0.44	108.17	–1.83	108.56	–1.44
BeO	O 1s	527.70	528.18	0.48	525.91	–1.79	526.30	–1.40
hex-BN	B 1s	188.35	187.73	–0.62	186.29	–2.06	186.89	–1.46
hex-BN	N 1s	396.00	395.71	–0.29	394.27	–1.73	394.87	–1.13
Diamond	C 1s	284.04	283.80	–0.24	282.57	–1.47	283.35	–0.69
beta-SiC	Si 2p	99.20	98.72	–0.48	97.68	–1.52	98.40	–0.80
beta-SiC	C 1s	281.55	280.92	–0.63	279.88	–1.67	280.60	–0.95
Si	Si 2p	99.03	98.64	–0.39	97.95	–1.08	98.65	–0.38
Mean error:				–0.53		–1.45		–0.86
Mean absolute error:				0.66		1.45		0.90

^aAll energies are given in eV.