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

For NH4 (Ammonium radical)

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 -0.000196 -0.001742 -0.001742 -0.001140 -0.003121 -0.003613 -0.003856 -0.018586 -0.019126 -0.008732 -0.022465 -0.017282 -0.002575 -0.015643 -0.030206 -0.002904 -0.017637 -0.030833 -0.002948 -0.017960
MP3=FULL         -0.002939   -0.003685       -0.023132 -0.017862 -0.002401 -0.015922         -0.002772 -0.018385
MP4=FULL   -0.001651     -0.002934       -0.019661   -0.023274   -0.002371 -0.015983   -0.002702 -0.018123   -0.002747 -0.018459
B2PLYP=FULL -0.000057 -0.000512 -0.000512 -0.000334 -0.000913 -0.001051 -0.001120 -0.005266 -0.004693 -0.002506 -0.006393 -0.004906 -0.000752 -0.004501   -0.000848 -0.005063   -0.000861 -0.005153
Quadratic configuration interaction QCISD(T)=FULL         -0.002930           -0.023203   -0.002360 -0.015936   -0.002687 -0.018060   -0.002731 -0.018395
Coupled Cluster CCSD=FULL         -0.002894         -0.008807 -0.023029 -0.017809 -0.002334 -0.015820 -0.031104 -0.002659 -0.017937 -0.031755 -0.002703 -0.018274
CCSD(T)=FULL         -0.002931           -0.023201 -0.017906 -0.002360 -0.015936 -0.031353 -0.002687 -0.018061 -0.032004 -0.002731 -0.018396
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