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

For Br- (Bromine atom 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 daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL 0.000000 -0.003139 -0.009790 -0.009790 -0.026255 -0.026255 -0.026870 -0.394355 -0.394355 -0.079770 -0.440802 -0.064711 -0.007482 -0.043927 -0.079779 -0.009333 -0.046433 -0.080944 -0.009794 -0.047058
MP3=FULL         -0.024391   -0.061536       -0.390324 -0.053962 -0.006444 -0.037734         -0.008497 -0.040512
MP4=FULL   -0.002967     -0.025182       -0.370540   -0.414250   -0.007023 -0.042054   -0.008963 -0.044582   -0.009418 -0.045184
B2PLYP=FULL   -0.000950 -0.002993 -0.002862 -0.008049 -0.008049 -0.008229 -0.115797 -0.115824 -0.024659 -0.129476 -0.019251 -0.002313 -0.013239   -0.002875 -0.013970   -0.003014 -0.014152
Quadratic configuration interaction QCISD(T)=FULL         -0.025049           -0.407430   -0.006915 -0.040774   -0.008753 -0.043160   -0.009194 -0.043744
Coupled Cluster CCSD=FULL         -0.024523         -0.074021 -0.403187 -0.056581 -0.006558 -0.039133 -0.071176 -0.008285 -0.041453 -0.072271 -0.008705 -0.042028
CCSD(T)=FULL         -0.025033           -0.407267 -0.058296 -0.006910 -0.040690 -0.073214 -0.008729 -0.043058 -0.074326 -0.009169 -0.043640
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