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

For HCCO (ketenyl 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 cc-pV(T+d)Z daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.000818 -0.004954 -0.004954 -0.003534 -0.012289 -0.012452 -0.012924 -0.055607 -0.055752 -0.021900 -0.066462 -0.050678 -0.006633 -0.041648 -0.084515 -0.007748 -0.048404   -0.041648 -0.008080  
MP3=FULL         -0.012067   -0.012710       -0.068928 -0.052804 -0.006217 -0.042748           -0.007661 -0.052603
MP4=FULL   -0.004730     -0.012035       -0.057801   -0.069318   -0.006160 -0.042603   -0.007268 -0.049873     -0.007594 -0.052488
B2PLYP=FULL -0.000251 -0.001474 -0.001474 -0.001058 -0.003636 -0.003686 -0.003826 -0.015861 -0.015912 -0.006385 -0.019077 -0.014469 -0.001976 -0.012144   -0.002305 -0.014025     -0.002403  
Quadratic configuration interaction QCISD(T)=FULL         -0.012002           -0.069278   -0.006140 -0.042728   -0.007236 -0.049890     -0.007562 -0.052500
Coupled Cluster CCSD=FULL         -0.011913         -0.021820 -0.068678 -0.052715 -0.006069 -0.042504 -0.087526 -0.007155 -0.049635 -0.089953   -0.007478 -0.052268
CCSD(T)=FULL         -0.012020           -0.069269 -0.052995 -0.006145 -0.042746 -0.090100 -0.007241 -0.049918 -0.090822   -0.007567 -0.052531
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 cc-pV(T+d)Z daug-cc-pVDZ daug-cc-pVTZ