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

For C4H8 (methylcyclopropane)

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 aug-cc-pVDZ aug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.001912 -0.006674 -0.006674 -0.005390 -0.019207 -0.020652 -0.020903 -0.074662 -0.075819 -0.033933 -0.068381 -0.010547 -0.064099 -0.012347 -0.075379
MP3=FULL         -0.018983   -0.020685       -0.071628 -0.009949 -0.066082    
MP4=FULL   -0.006389     -0.019071       -0.079251     -0.009933 -0.066546 -0.011720 -0.078441
B2PLYP=FULL -0.000579 -0.001999 -0.001999 -0.001611 -0.005678 -0.006092 -0.006167 -0.021381 -0.021728 -0.009875 -0.019609 -0.003145 -0.018596 -0.003678 -0.021787
Quadratic configuration interaction QCISD(T)=FULL         -0.019023             -0.009874 -0.066417 -0.011653  
Coupled Cluster CCSD=FULL         -0.018814         -0.034091 -0.071568 -0.009732 -0.065845 -0.011490 -0.078035
CCSD(T)=FULL         -0.019029           -0.095156 -0.009874 -0.066420 -0.011654  
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 aug-cc-pVDZ aug-cc-pVTZ