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

For N2H2 ((Z)-Diazene)

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
Moller Plesset perturbation MP2=FULL -0.000372 -0.003451 -0.003451 -0.002236 -0.006339 -0.006638 -0.006961   -0.037455 -0.016127 -0.034139 -0.004457 -0.026961 -0.057859 -0.004916 -0.031409 -0.058712
MP3=FULL         -0.006000   -0.006625       -0.035308 -0.004130 -0.027350        
MP4=FULL   -0.003233     -0.005968       -0.038508     -0.004070 -0.027340   -0.004524 -0.032098  
B2PLYP=FULL -0.000111 -0.001018 -0.001018 -0.000658 -0.001865 -0.001949 -0.002044 -0.010546 -0.010630 -0.004661 -0.009697 -0.001312 -0.007824   -0.001450 -0.009082  
Quadratic configuration interaction QCISD(T)=FULL         -0.005950             -0.004050 -0.027301   -0.004502 -0.032071  
QCISD(TQ)=FULL         -0.005950   -0.006563         -0.004044 -0.027297 -0.060103 -0.004495 -0.032071  
Coupled Cluster CCSD=FULL         -0.005876         -0.016187 -0.035162 -0.003991 -0.027058 -0.059484 -0.004438 -0.031843 -0.060372
CCSD(T)=FULL         -0.005955           -0.035389 -0.004052 -0.027306 -0.060093 -0.004504 -0.032077 -0.060989
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