National Institute of Standards and Technology

Computational Chemistry Comparison and Benchmark DataBase
Release 22	May 2022
NIST Standard Reference Database 101

I	Introduction
II	Experimental data
III	Calculated data
IV	Data comparisons
V	Cost comparisons
VI	Input and output files
VII	Tutorials and Units
VIII	Links to other sites
IX	Feedback
X	Older CCCBDB versions
XII	Geometries
XIII	Vibrations
XIV	Reaction data
XV	Entropy data
XVI	Bibliographic data
XVII	Ion data
XVIII	Bad calculations
XIX	Index of properties
XX	H-bond dimers
XXI	Oddities

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III.F.2.

Completed calculations for C₄H₈ (cyclobutane)

Methods and basis sets for which an energy has been calculated. "e" indicates just an energy has been calculated. "o" indicates an optimized geometry. "v" indicates vibrational frequencies. "s" followed by a number indicates completed calculations for different states (for example s1ov). "c" followed by a number indicates completed calculations for different conformations (for example c2ov).
See the Calculated Energies page (section III.A.1) for more calculated properties.

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Methods with predefined basis sets

semi-empirical	PM3	ov
composite	G1	e
	G2MP2	e
	G2	e
	G3	e
	G3B3	e
	G3MP2	e
	G4	e
	CBS-Q	e

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Methods with standard basis sets

		STO-3G	3-21G	3-21G*	6-31G	6-31G*	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-pVDZ	aug-cc-pVTZ	cc-pV(T+d)Z	daug-cc-pVTZ
hartree fock	HF	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov	o	ov	ov	ov	ov	ov
density functional	LSDA								ov				ov				ov
	BLYP	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov		ov	ov	ov	ov	ov	ov
	B1B95	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov		ov	ov	ov	ov	ov	ov
	B3LYP	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov	o	ov	ov	ov	ov
	B3LYPultrafine		ov			ov	ov	ov	ov				ov	ov	ov	ov	ov
	B3PW91	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov		ov	ov	ov	ov	ov	ov
	mPW1PW91	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov		ov	ov	ov	ov	ov	ov
	M06-2X	ov	ov	o	ov	o	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov
	PBEPBE	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov
	PBEPBEultrafine		ov			ov	ov	ov	ov				ov	ov	ov	ov	ov
	PBE1PBE	ov	ov	ov	ov	o	ov	ov	ov	ov	ov		ov	ov	ov	ov	ov
	HSEh1PBE	ov	ov	ov	ov	ov	ov	o	ov	ov	ov		ov	ov	ov	ov	ov
	TPSSh		ov	ov	ov	ov	ov	ov	ov		ov		ov	ov	ov	ov	ov
	wB97X-D	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov		ov	ov	ov	ov	ov
	B97D3		o			ov		o		ov		ov			ov		ov		ov
		STO-3G	3-21G	3-21G*	6-31G	6-31G*	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-pVDZ	aug-cc-pVTZ	cc-pV(T+d)Z	daug-cc-pVTZ
Moller Plesset perturbation	MP2	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov		ov	ov	ov	ov	ov	ov
	MP2=FULL	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov		ov	ov	ov	ov	ov
	MP3					ov		ov					ov	ov	ov
	MP3=FULL		ov	ov	ov	ov	ov	ov	ov	ov	ov		ov	ov	ov	ov	ov
	MP4		ov			ov				ov			ov	ov	ov	ov	ov
	MP4=FULL		ov			ov				ov				ov	ov	o	o
	B2PLYP	ov	ov	ov	ov	o	ov	o	ov	o	ov		ov	ov	ov	ov	ov
	B2PLYP=FULL	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov		ov	ov	ov	ov	o
	B2PLYP=FULLultrafine	ov	ov	ov	ov	ov	ov	ov	ov	ov	ov		ov	ov	ov	ov	ov
Configuration interaction	CID		ov	ov	ov	ov			ov
	CISD		ov	ov	ov	ov			ov
		STO-3G	3-21G	3-21G*	6-31G	6-31G*	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-pVDZ	aug-cc-pVTZ	cc-pV(T+d)Z	daug-cc-pVTZ
Quadratic configuration interaction	QCISD		ov	ov	ov	ov	ov	ov	ov	ov	ov		ov	ov	ov	ov	dnf
	QCISD(T)					ov			ov				dnf		ov	o	o
	QCISD(T)=FULL					ov		ov						ov	ov	o	o
	QCISD(TQ)					ov		dnf						o
	QCISD(TQ)=FULL					dnf		dnf						dnf	dnf	dnf	dnf
Coupled Cluster	CCD		ov	ov	ov	ov	ov	ov	ov	ov	ov		ov	ov	ov	ov	ov
	CCSD					ov					ov		ov	ov	ov	ov	dnf
	CCSD=FULL					ov					ov		ov	ov	dnf	ov	o
	CCSD(T)					ov	ov		ov				ov	ov	ov	ov	o
	CCSD(T)=FULL					ov							ov	ov	ov	ov	o
		STO-3G	3-21G	3-21G*	6-31G	6-31G*	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-pVDZ	aug-cc-pVTZ	cc-pV(T+d)Z	daug-cc-pVTZ

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Methods with effective core potentials (select basis sets)

		CEP-31G	CEP-31G*	CEP-121G	CEP-121G*	LANL2DZ	SDD	cc-pVTZ-PP	aug-cc-pVTZ-PP	Def2TZVPP
hartree fock	HF	ov	ov	ov	ov	ov	ov			ov
density functional	B1B95	ov	ov
	B3LYP	ov	ov	ov	ov	ov	ov			ov
	PBEPBE									ov
	wB97X-D	ov	ov	ov	ov	ov	ov
Moller Plesset perturbation	MP2	ov	ov	ov	ov	ov	ov			ov

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Single point energy calculations (select basis sets)

		6-311+G(3df,2p)	cc-pVDZ	cc-pVTZ	aug-cc-pVDZ	aug-cc-pVTZ	cc-pV(T+d)Z
Moller Plesset perturbation	MP2FC// HF/6-31G*	e	e	e	e		e
	MP2FC// B3LYP/6-31G*	e	e	e	e		e
	MP2FC// MP2FC/6-31G*	e	e	e	e	e	e
	MP4// HF/6-31G*	e	e	e			e
	MP4// B3LYP/6-31G*		e	e			e
	MP4// MP2/6-31G*	e		e			e
Coupled Cluster	CCSD// HF/6-31G*		e	e			e
	CCSD(T)// HF/6-31G*		e	e			e
	CCSD// B3LYP/6-31G*	e	e
	CCSD(T)// B3LYP/6-31G*	e	e
	CCSD(T)//B3LYP/6-31G(2df,p)			e			e
	CCSD// MP2FC/6-31G*	e	e	e	e	e	e
	CCSD(T)// MP2FC/6-31G*	e	e	e	e	e	e

Barriers to internal rotation or inversion

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Methods with predefined basis sets

semi-empirical	AM1	s1c1t1
	PM3	s1c1t1

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Methods with standard basis sets

		3-21G	6-31G*	6-31+G**	cc-pVTZ
hartree fock	HF	s1c1t1	s1c1t1	s1c1t1	s1c1t1
density functional	B3LYP	s1c1t1	s1c1t1	s1c1t1	s1c1t1
		3-21G	6-31G*	6-31+G**	cc-pVTZ
Moller Plesset perturbation	MP2	s1c1t1	s1c1t1	s1c1t1	s1c1t1
		3-21G	6-31G*	6-31+G**	cc-pVTZ

For descriptions of the methods (AM1, HF, MP2, ...) and basis sets (3-21G, 3-21G*, 6-31G, ...) see the glossary in section I.C. Predefined means the basis set used is determined by the method.