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

For C2H2N2O (Furazan)

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) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.001358 -0.008673 -0.008673 -0.006026 -0.019168 -0.019509 -0.020563 -0.093537 -0.093864 -0.039599 -0.111864 -0.085491 -0.011465 -0.070917 -0.143172 -0.013496 -0.083044 -0.146279 -0.013964 -0.085838
MP3=FULL         -0.018519   -0.019927       -0.115603 -0.088672 -0.010664 -0.072362            
MP4=FULL   -0.008192     -0.018494       -0.096890   -0.116232   -0.010587 -0.072292   -0.012599 -0.085316      
B2PLYP=FULL -0.000408 -0.002570 -0.002570 -0.001783 -0.005652 -0.005749 -0.006056 -0.026600 -0.026698 -0.011489 -0.031990 -0.024342 -0.003390 -0.020553   -0.003990 -0.023990   -0.004128 -0.024784
Quadratic configuration interaction QCISD(T)=FULL         -0.018430           -0.116037   -0.010526 -0.072258   -0.012513 -0.085341      
Coupled Cluster CCSD=FULL         -0.018244         -0.039528 -0.114970 -0.088401 -0.010383 -0.071745   -0.012357 -0.084886      
CCSD(T)=FULL         -0.018447           -0.116035   -0.010534 -0.072291   -0.012522        
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 daug-cc-pVDZ daug-cc-pVTZ