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Energy differences between frozen core and all electrons correlated.
MP2, MP3, MP4, B2PLYP, CCSD, and CCSD(T)

For P2 (Phosphorus diatomic)

Energies in Hartree
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) 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
Moller Plesset perturbation MP2=FULL -0.002661 -0.011963 -0.027238 -0.007249 -0.022496 -0.022496 -0.023945 -0.248401 -0.248401 -0.042127 -0.059853 -0.013505 -0.083676 -0.105451 -0.015059 -0.088552 -0.106549 -0.104263 -0.207927 -0.212663 -0.417101 -0.649293
MP3=FULL         -0.021185   -0.025065       -0.058495 -0.012282 -0.081678             -0.210505    
MP4=FULL   -0.011244     -0.021609       -0.248193     -0.012599 -0.083854   -0.014174 -0.088821       -0.214153    
B2PLYP=FULL -0.000877 -0.003704 -0.008404 -0.002242 -0.006917 -0.006917 -0.007359 -0.072228 -0.072228 -0.012898 -0.017878 -0.004207 -0.025270   -0.004682 -0.026699       -0.063011    
Coupled Cluster CCSD=FULL         -0.020731           -0.058085 -0.011981 -0.081280 -0.103333 -0.013479 -0.086279 -0.104420     -0.209852    
CCSD(T)=FULL         -0.021420           -0.059509 -0.012484 -0.083430 -0.105964 -0.014040 -0.088415 -0.107063 -0.086508 -0.183907 -0.213287 -0.418169 -0.653437
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 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