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

For Ne (Neon atom)

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) 6-311+G(3df,2pd) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pV(T+d)Z cc-pCVTZ
Moller Plesset perturbation MP2=FULL 0.000000 -0.001864 -0.001864 -0.000906 -0.001454 -0.001454 -0.001831 -0.018920 -0.018920 -0.003332 -0.024037 -0.024037 -0.017204 -0.002044 -0.012969 -0.032686 -0.002186 -0.013387 -0.032768 -0.012969 -0.057453
MP3=FULL   -0.001642 -0.001642 -0.000762 -0.001264 -0.001264 -0.001635 -0.018950 -0.018950 -0.003083     -0.017347 -0.001845 -0.012642   -0.001983 -0.013077      
MP4=FULL   -0.001673 -0.001673 -0.000802 -0.001321 -0.001321 -0.001700 -0.018960 -0.018960 -0.003142 -0.029815 -0.024298 -0.017408 -0.001870 -0.012686 -0.033080 -0.002021 -0.013120 -0.033152   -0.058518
B2PLYP=FULL 0.000000 -0.000535 -0.000535 -0.000260 -0.000415 -0.000415 -0.000520 -0.005277 -0.005277 -0.000950     -0.004802 -0.000583 -0.003677   -0.000623 -0.003794      
Quadratic configuration interaction QCISD(T)=FULL         -0.001299   -0.001669             -0.001858 -0.012676 -0.033068 -0.002001 -0.013109 -0.033144    
QCISD(TQ)=FULL         -0.001292   -0.001661             -0.001854 -0.012677 -0.033076 -0.001995 -0.013110 -0.033153    
Coupled Cluster CCSD=FULL   -0.001658 -0.001658 -0.000778 -0.001282 -0.001282 -0.001653 -0.018906 -0.018906 -0.003096 -0.024191 -0.024191 -0.017348 -0.001845 -0.012606 -0.032904 -0.001984 -0.013034 -0.032977    
CCSD(T)=FULL   -0.001666 -0.001666 -0.000787 -0.001298 -0.001298 0.000000 -0.018952 -0.018952 -0.003118 -0.024298 -0.024298 -0.017392 -0.001857 -0.012677 -0.033072 -0.002000 -0.013110 -0.033148   -0.058502
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) 6-311+G(3df,2pd) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pV(T+d)Z cc-pCVTZ