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

For CH3O- (methoxy anion)

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
Moller Plesset perturbation MP2=FULL -0.000491 -0.003378 -0.003378 -0.002293 -0.007149 -0.007530 -0.007901 -0.037033 -0.037476 -0.014377 -0.044434 -0.033933 -0.004659 -0.028216 -0.057851 -0.005376 -0.032324 -0.058863
MP3=FULL         -0.006896   -0.043891       -0.045848 -0.035175 -0.004354 -0.028664        
MP4=FULL   -0.003197     -0.006948       -0.038675   -0.046118   -0.004326 -0.028784   -0.005039 -0.033204  
B2PLYP=FULL -0.000147 -0.000998 -0.000998 -0.000676 -0.002105 -0.002210 -0.002317 -0.010512 -0.010644 -0.004161 -0.012679 -0.009645 -0.001368 -0.008150   -0.001582 -0.009319  
Quadratic configuration interaction QCISD(T)=FULL         -0.006918           -0.046067   -0.004302 -0.028739   -0.005004 -0.033172  
Coupled Cluster CCSD=FULL         -0.006837         -0.014280 -0.045660 -0.035110 -0.004255 -0.028491 -0.059628 -0.004941 -0.032905 -0.060671
CCSD(T)=FULL         1.905881           -0.046070 -0.035301 -0.004304 -0.028747 -0.060176 -0.005005 -0.033182 -0.061240
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