National Institute of Standards and Technology
Computational Chemistry Comparison and Benchmark DataBase
Release 22May 2022
NIST Standard Reference Database 101
IIntroduction
IIExperimental data
IIICalculated data
IVData comparisons
VCost comparisons
VIInput and output files
VIITutorials and Units
VIIILinks to other sites
IXFeedback
XOlder CCCBDB versions
XIIGeometries
XIII Vibrations
XIVReaction data
XVEntropy data
XVIBibliographic data
XVIIIon data
XVIIIBad calculations
XIXIndex of properties
XXH-bond dimers
XXIOddities

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III.F.2.

Completed calculations for CH3CH (methylmethylene)

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.
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

Methods with standard basis sets
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     ov           ov       ov
density functional BLYP     ov                    
B3LYP                 ov        
B3LYPultrafine                       o  
M06-2X   ov ov         ov          
PBE1PBE     ov                    
HSEh1PBE ov   ov ov             ov    
TPSSh     ov ov     ov       ov    
wB97X-D   ov ov ov   ov     ov ov ov ov  
B97D3 ov   ov ov   ov   ov ov   ov ov ov
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     ov   ov       ov        
MP2=FULL                       o  
MP3       o                  
MP3=FULL     ov ov                  
B2PLYP     ov               ov    
B2PLYP=FULLultrafine     ov             ov ov ov  
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

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
density functional B3LYP                 ov
PBEPBE                 ov
Moller Plesset perturbation MP2                 ov

Single point energy calculations (select basis sets)
cc-pVTZ aug-cc-pVTZ
Moller Plesset perturbation MP2FC// B3LYP/6-31G* e  
MP2FC// MP2FC/6-31G*   e
Coupled Cluster CCSD(T)// B3LYP/6-31G* e  
CCSD// MP2FC/6-31G*   e
CCSD(T)// MP2FC/6-31G*   e

Barriers to internal rotation or inversion


Methods with predefined basis sets
semi-empirical AM1 s1c1t1
PM3 s1c1t1

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
Coupled Cluster CCD     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.