CCCBDB Ionization Energy page 2

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		3-21G	3-21G*	6-31G*	6-31+G**	6-311G*	6-311G**	6-31G(2df,p)	6-311+G(3df,2p)	TZVP	cc-pVDZ	cc-pVTZ	aug-cc-pVTZ	daug-cc-pVTZ
hartree fock	HF									11.895				11.864
density functional	BLYP			11.887
	B3LYP							11.782		11.869			11.857
	M06-2X		11.946
	HSEh1PBE	11.990		12.054								11.779
	TPSSh			11.967
	wB97X-D		12.010	12.026	11.707		11.789			11.781	11.707	11.761	11.768
	B97D3	11.878		11.924	11.621		11.726		11.701	11.715		11.704	11.721
		3-21G	3-21G*	6-31G*	6-31+G**	6-311G*	6-311G**	6-31G(2df,p)	6-311+G(3df,2p)	TZVP	cc-pVDZ	cc-pVTZ	aug-cc-pVTZ	daug-cc-pVTZ
Moller Plesset perturbation	MP2			12.117		12.119				11.816
	MP3=FULL			12.088	11.765
	B2PLYP											11.770
		3-21G	3-21G*	6-31G*	6-31+G**	6-311G*	6-311G**	6-31G(2df,p)	6-311+G(3df,2p)	TZVP	cc-pVDZ	cc-pVTZ	aug-cc-pVTZ	daug-cc-pVTZ

		CEP-31G	CEP-31G*	CEP-121G	CEP-121G*	LANL2DZ	SDD	cc-pVTZ-PP	aug-cc-pVTZ-PP	Def2TZVPP
hartree fock	HF									11.865
density functional	B3LYP									11.843
density functional	PBEPBE									11.692
Moller Plesset perturbation	MP2									11.785

	Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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Calculated Ionization Energy for HeH (Helium hydride)