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Calculated Frequencies for C3H4O2 (Methyl glyoxal) 1A' Cs

19 07 18 15 43
InChI=1S/C3H4O2/c1-3(5)2-4/h2H,1H3 INChIKey=AIJULSRZWUXGPQ-UHFFFAOYSA-N


Click on an entry for details. A subscript indicates the number of imaginary frequencies.
An R subscript indicates raman activity data is available.
For a comparison of experimental versus calculated see section IV.C.1 Compare vibrational frequencies
Methods with predefined basis sets
semi-empirical AM1 freq1
PM3 freq1
PM6 freq1
composite G2 freq
G3 freq
G3B3 freq
G4 freq
CBS-Q freq

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 daug-cc-pVTZ
hartree fock HF freq freq freq freq freq freq freq freq freq freq   freq freq freq freq freq freq
density functional LSDA   freq1     freq1 freq1 freq1 freq1 freq1 freq1     freq1 freq1 freq freq  
BLYP freq1 freq1 freq1 freq freq freq freq freq freq freq   freq freq freq      
B1B95 freq freq freq freq1 freq1 freq1 freq1 freq1 freq1 freq   freq1 freq freq1 freq1 freq1  
B3LYP freq freq1 freq1 freq freq freq freq freq freq freq   freq freq freq freq freq  
B3LYPultrafine         freq               freq freq freq freq  
B3PW91 freq freq1 freq1 freq freq freq freq freq freq freq   freq freq freq      
mPW1PW91 freq freq1 freq1 freq freq freq freq freq freq freq   freq freq freq freq freq  
M06-2X freq freq freq freq freq freq freq freq freq freq freqR freq freq freq freq freq  
PBEPBE freq1 freq1 freq1 freq freq freq freq freq freq freq   freq freq freq freq freq  
PBEPBEultrafine         freq               freq freq freq freq  
PBE1PBE freq freq1 freq1 freq freq freq freq freq freq freq   freq freq freq freq freq  
HSEh1PBE freq freq1 freq1 freq freq freq   freq freq freq   freq freq freq freq freq  
TPSSh                   freq              
wB97X-D     freq   freq1   freq1   freq1     freq1 freq1 freq1   freq1  
B97D3   freq1     freq   freq   freq   freq freq   freq   freq freqR
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 daug-cc-pVTZ
Moller Plesset perturbation MP2 freq freq freq freq freq freq freq freq freq freq   freq freq freq freq freq  
MP2=FULL freq freq freq freq freq freq freq freq freq freq   freq freq freq freq freq  
MP3         freq                        
MP4   freq     freq       freq     freq freq freq freq    
MP4=FULL   freq     freq       freq       freq freq freq    
B2PLYP=FULLultrafine         freqR               freqR freqR   freq  
Configuration interaction CID   freq freq freq freq     freq                  
CISD   freq freq freq freq     freq                  
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 daug-cc-pVTZ
Quadratic configuration interaction QCISD   freq freq freq freq freq freq freq freq     freq freq freq freq    
QCISD(T)         freq             freq freq freq      
Coupled Cluster CCD   freq freq freq freq freq freq freq freq freq   freq freq freq freq freq  
CCSD         freq             freq freq        
CCSD=FULL         freq             freq freq        
CCSD(T)         freq             freq freq        
CCSD(T)=FULL         freq             freq freq freq      
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 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 freq freq freq freq freq freq     freq
density functional B3LYP freq freq freq freq freq freq     freq
PBEPBE                 freq
Moller Plesset perturbation MP2 freq freq freq freq freq freq     freq
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.
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