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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The National Institute of Standards and Technology (NIST) is an agency of the U.S. Department of Commerce.

Please send questions, comments, corrections, additions and suggestions to cccbdb@nist.gov.

III.F.2.

Completed calculations for C₃O₂ (Carbon suboxide)

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

composite	G1	c1e
	G2MP2	c1e
	G2	c1e
	G3	c1e
	G3B3	c1e
	G3MP2	c1e
	G4	c1e
	CBS-Q	c1e

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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	cc-pVQZ	aug-cc-pVDZ	aug-cc-pVTZ	aug-cc-pVQZ	cc-pV(T+d)Z	daug-cc-pVDZ	daug-cc-pVTZ
hartree fock	HF	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1o	c1o c2ov	c1o c2ov	c1o c2ov	c1o c2ov	c1o c2ov	c1o c2ov	c1o	c1o c2ov	c1o c2ov	c1o	c2ov	c1o	c1o c2ov
density functional	LSDA	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov			c1ov	c1ov		c1ov			c1ov
	BLYP	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov		c1o c2ov	c1ov		c1ov	c1o	c1ov
	B1B95	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov		c1o c2ov	c1ov		c1ov		c1ov
	B3LYP	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov c2ov	c1ov	c1ov	c1ov	c1o c2ov	c1ov	c1ov	c1ov	c1o	c1ov
	B3LYPultrafine		c1ov			c1ov	c1ov	c1ov	c1ov		c1ov	c1ov	c1ov	c1ov	c1ov		c1o	c1ov			c1o	c1ov
	B3PW91	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov		c1o c2ov	c1ov		c1ov	c1o	c1ov
	mPW1PW91	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov c2ov		c1o c2ov	c1ov		c2ov	c1o	c1ov
	M06-2X	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1o	c1ov	c1ov	c1o		c1o	c1o			c1o	c1o
	PBEPBE	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov		c1ov	c1ov		c1ov	c1ov	c1ov
	PBEPBEultrafine		c1ov			c1ov	c1ov	c1ov	c1ov		c1ov	c1ov	c1ov	c1ov	c1ov		c1ov	c1ov			c1ov	c1ov
	PBE1PBE	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov		c1o	c1ov			c1o	c1ov
	HSEh1PBE	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov		c1o	c1ov			c1o	c1ov
	TPSSh	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1o	c1ov	c1ov		c1o	c1ov
	wB97X-D	c1ov	c1ov	c1ov c2o	c1ov	c1ov c2ov	c1ov	c1ov c2ov	c1ov	c1ov c2ov	c1ov	c1o	c1ov c2ov	c1ov c2ov	c1o c2ov	c1o	c1o	c1o c2ov	c1o		c1o	c1o
	B97D3	c1ov	c1ov c2ov	c1ov	c1ov	c1ov c2o	c1ov	c1ov c2ov	c1ov	c1ov c2o	c1ov	c1ov c2ov	c1ov	c1ov	c1ov c2ov	c1ov	c1o	c1ov c2o	c1o		c1o	c1ov
		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	cc-pVQZ	aug-cc-pVDZ	aug-cc-pVTZ	aug-cc-pVQZ	cc-pV(T+d)Z	daug-cc-pVDZ	daug-cc-pVTZ
Moller Plesset perturbation	MP2	c1ov	c1ov	c1ov	c1o c2ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1o c2ov	c1ov	c1ov	c1ov	c1o	c1o	c1ov	c1ov	c1o	c1o
	MP2=FULL	c1ov	c1ov	c1ov	c1o	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1dnf	c1o	c1ov	c1ov	c1o	c1o	c1ov	c1dnf		c1o	c1o
	MP3					c1ov c2ov		c1ov				c1o	c1o	c1ov	c1o						c1o	c1o
	MP3=FULL		c1ov	c1ov	c1o	c1ov	c1ov	c1ov	c1o	c1o	c1ov	c1o	c1o	c1ov	c1o		c1o	c1ov			c1o	c1o
	MP4		c1ov			c1ov				c1ov		c1ov	c1o	c1ov	c1ov		c1o	c1o			c1o	c1o
	MP4=FULL		c1ov			c1ov				c1ov		c1ov		c1ov	c1ov		c1o	c1ov			c1o	c1o
	B2PLYP	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1o	c1ov	c1ov		c1o	c1ov			c1o	c1ov
	B2PLYP=FULL	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1o	c1ov	c1ov		c1o	c1ov			c1o	c1ov
	B2PLYP=FULLultrafine	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov	c1o	c1ov	c1ov		c1o	c1ov			c1o	c1ov
Configuration interaction	CID		c1ov	c1ov	c1o	c1ov			c1o			c1o		c1ov	c1o						c1o	c1o
	CISD		c1ov	c1ov	c1o	c1ov			c1o			c1o		c1ov	c1o						c1o	c1o
		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	cc-pVQZ	aug-cc-pVDZ	aug-cc-pVTZ	aug-cc-pVQZ	cc-pV(T+d)Z	daug-cc-pVDZ	daug-cc-pVTZ
Quadratic configuration interaction	QCISD		c1ov	c1ov	c1o	c1ov	c1ov	c1ov	c1o	c1o c2ov	c1ov	c1o	c1o	c1ov	c1o		c1o	c1o			c1o	c1o
	QCISD(T)					c1ov			c1o			c1o	c1o	c1ov	c1o		c1o	c1o			c1o	c1o
	QCISD(T)=FULL					c1ov		c1ov				c1ov		c1ov	c1o	c1ov	c1o	c1ov	c1o		c1o	c1o
Coupled Cluster	CCD		c1ov	c1ov	c1o	c1ov	c1ov	c1ov	c1o	c1o	c1o	c1o	c1o	c1ov	c1o		c1o	c1o			c1o	c1o
	CCSD					c1ov	c1ov	c1ov	c1o	c1o	c1o	c1o	c1o	c1ov	c1o	c1o	c1o	c1o			c1o	c1o
	CCSD=FULL					c1ov					c1ov	c1o	c1o	c1ov	c1o	c1dnf	c1o	c1ov			c1o	c1o
	CCSD(T)					c1ov	c1ov	c1ov	c1o	c1o	c1ov	c1o	c1o	c1ov	c1o c2ov	c1o	c1o	c1o	c1o	c2ov	c1o	c1o
	CCSD(T)=FULL					c1ov						c1ov	c1o	c1ov	c1o	c1ov	c1o	c1ov	c1o		c1o	c1o
		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	cc-pVQZ	aug-cc-pVDZ	aug-cc-pVTZ	aug-cc-pVQZ	cc-pV(T+d)Z	daug-cc-pVDZ	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	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov			c1o c2ov
density functional	BLYP									c1ov
	B1B95	c1ov	c1ov							c1ov
	B3LYP	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov			c1ov
	B3LYPultrafine									c1ov
	B3PW91									c1ov
	mPW1PW91									c1ov
	M06-2X									c1ov
	PBEPBE									c1ov
	PBEPBEultrafine									c1ov
	PBE1PBE									c1ov
	HSEh1PBE									c1ov
	TPSSh									c1ov
	wB97X-D	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov			c1ov
	B97D3									c1ov
Moller Plesset perturbation	MP2	c1ov	c1ov	c1ov	c1ov	c1ov	c1ov			c1ov
	MP2=FULL									c1ov
	MP3									c1o
	MP3=FULL									c1ov
	MP4=FULL									c1ov
	B2PLYP									c1ov
	B2PLYP=FULL									c1ov
	B2PLYP=FULLultrafine									c1ov
Configuration interaction	CID									c1o
	CISD									c1o
Quadratic configuration interaction	QCISD									c1dnf
	QCISD(T)									c1o
	QCISD(T)=FULL									c1ov
Coupled Cluster	CCD									c1o
	CCSD									c1o
	CCSD=FULL									c1ov
	CCSD(T)									c1o
	CCSD(T)=FULL									c1ov

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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*		c1e	c1e			c1e
	MP2FC// B3LYP/6-31G*		c1e
	MP2FC// MP2FC/6-31G*	c1e	c1e	c1e	c1e	c1e	c1e
	MP4// HF/6-31G*		c1e
	MP4// MP2/6-31G*	c1e
Coupled Cluster	CCSD// HF/6-31G*		c1e	c1e			c1e
	CCSD(T)// HF/6-31G*		c1e	c1e			c1e
	CCSD(T)//B3LYP/6-31G(2df,p)			c1e			c1e
	CCSD// MP2FC/6-31G*	c1e	c1e	c1e		c1e	c1e
	CCSD(T)// MP2FC/6-31G*	c1e	c1e	c1e		c1e	c1e

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.