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Calculated Frequencies for Si3H8 (trisilane) 1A1 C2v

19 07 18 15 43
InChI=1S/H8Si3/c1-3-2/h3H2,1-2H3 INChIKey=VEDJZFSRVVQBIL-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 freq
PM3 freq
PM6 freq
composite G2 freqR
G3 freqR
G3B3 freq
G4 freq
CBS-Q freqR

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(D+d)Z cc-pV(T+d)Z aug-cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ aug-cc-pCVTZ daug-cc-pVDZ daug-cc-pVTZ
hartree fock HF freqR freqR freqR freqR freqR freqR freqR freqR freqR freqR freqR freqR freqR freqR freqR freqR freqR freqR freqR freqR freqR freqR freqR freqR freqR freqR
density functional LSDA                                     freq freq freq freq freq freq    
BLYP freq freq1 freq1 freq freq freq freq freq freq freq freq freq freq freq   freq freq   freq freq freq freq freq freq freq freq
B1B95 freq freq2 freq2 freq1 freq1 freq1 freq freq freq freq freq freq freq freq   freq1 freq   freq freq freq freq freq freq dnf freq
B3LYP freq freq freq freq freq freq freq freq freq freq freq freq freq freq freq freq freq freq freq freq freq freq freq freq freq freq
B3LYPultrafine   freq     freq freq freq freq   freq freq freq freq freq   freq freq   freq freq freq freq freq freq freq freq
B3PW91 freq freq1 freq1 freq freq freq freq freq freq freq freq freq freq freq   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 freq   freq freq freq freq freq freq freq freq
M06-2X freq freq2 freq1 freq freq freq freq freq freq freq freqR freq freq freq   freq freq   freq freq freq freq freq freq freq freq
PBEPBE freq freq1 freq1 freq freq freq freq freq freq freq freq freq freq freq   freq freq   freq freq freq freq freq freq freq freq
PBEPBEultrafine   freq     freq freq freq freq   freq freq freq freq freq   freq freq   freq freq freq freq freq freq freq freq
PBE1PBE freq freq1 freq1 freq freq freq freq freq freq freq freq freq 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   freq freq   freq freq freq freq freq freq freq freq
TPSSh freq freq1 freq2 freq1 freq freq freq freq freq freq freq freq freq freq freq freq1 freq freq freq freq freq freq freq freq freq1 freq
wB97X-D freq freq2 freq2 freq freq1 freq1 freq1 freq freq freq1 freq freq freq freq freq1 freq1 freq freq1 freq freq freq freq freq freq freq1 freq
B97D3 freq freq1 freq2 freq1 freq1 freq1 freq1 freq freq freq1 freq freq freq1 freq freq1 freq1 freq freq1 freq1 freq freq freq1 freq freq freq1 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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pV(D+d)Z cc-pV(T+d)Z aug-cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ aug-cc-pCVTZ daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2 freq freq freq freq freq freq freq freq freq freq 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 freq   freq freq freq freq freq freq freq freq freq
MP3         freq   freq         freq freq           freq freq   freq   dnf freq  
MP3=FULL   freq freq freq freq   freq freq freq freq freq freq freq     freq     freq freq   freq freq   freq dnf
MP4   freq     freq       freq   freq freq freq freq   freq freq   freq   freq freq freq   freq  
MP4=FULL   freq     freq       freq       freq freq   freq dnf   freq freq dnf freq     freq  
B2PLYP freq freq freq freq freq freq freq freq freq freq freq freq freq freq   freq freq   freq freq freq freq freq freq freq freq
B2PLYP=FULL freq freq freq freq freq freq freq freq freq freq freq freq freq freq   freq freq   freq freq freq freq freq freq freq freq
B2PLYP=FULLultrafine freq freq freq freq freqR freq freq freq freq freq freq freq freqR freqR   freq freq   freq freq freq freq freq freq freq freq
Configuration interaction CID   freq freq freq freq     freq     dnf   freq freq         freq freq   freq freq dnf   dnf
CISD   freq freq freq freq     freq     freq   freq freq         freq freq dnf freq freq   freq dnf
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(D+d)Z cc-pV(T+d)Z aug-cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ aug-cc-pCVTZ daug-cc-pVDZ daug-cc-pVTZ
Quadratic configuration interaction QCISD   freq freq freq freq freq freq freq freq freq dnf freq freq freq   freq     freq freq dnf freq   dnf freq dnf
QCISD(T)         freq     freq     freq freq freq freq   freq     freq freq freq freq freq dnf freq  
QCISD(T)=FULL         freq   freq           freq freq dnf freq dnf dnf freq     freq1   dnf freq dnf
Coupled Cluster CCD   freq freq freq freq freq freq freq freq freq freq freq freq     freq     freq freq dnf freq freq   freq dnf
CCSD         freq freq freq freq freq freq   freq freq freq   freq   dnf freq     freq     freq  
CCSD=FULL         freq         freq dnf freq freq freq       dnf freq     freq     freq dnf
CCSD(T)         freq freq freq freq freq freq freq freq freq     freq   dnf freq freq   freq freq      
CCSD(T)=FULL         freq           freq freq freq     freq dnf dnf freq     freq   dnf freq dnf
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(D+d)Z cc-pV(T+d)Z aug-cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ aug-cc-pCVTZ daug-cc-pVDZ 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 freqR freqR freqR freqR freqR freqR     freqR
density functional BLYP                 freq
B1B95                 freq
B3LYP freq freq freq freq freq freq     freq
B3LYPultrafine                 freq
B3PW91                 freq
mPW1PW91                 freq
M06-2X                 freq
PBEPBE                 freq
PBEPBEultrafine                 freq
PBE1PBE                 freq
HSEh1PBE                 freq
TPSSh                 freq
wB97X-D freq freq freq freq freq freq     freq
B97D3                 freq
Moller Plesset perturbation MP2 freq freq freq freq freq freq     freq
MP2=FULL                 freq
MP3                 freq
MP4                 freq
B2PLYP                 freq
B2PLYP=FULL                 freq
B2PLYP=FULLultrafine                 freq
Configuration interaction CID                 freq
CISD                 freq
Quadratic configuration interaction QCISD                 freq
QCISD(T)                 freq
Coupled Cluster CCD                 freq
CCSD                 freq
CCSD(T)                 freq
CCSD(T)=FULL                 dnf
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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