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

For SCl (sulfur monochloride)

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 cc-pV(T+d)Z aug-cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ
Moller Plesset perturbation MP2=FULL -0.000431 -0.009503 -0.024635 -0.005699 -0.020304 -0.020304 -0.021604 -0.169285 -0.169285 -0.039993 -0.055408 -0.012315 -0.068019 -0.121584 -0.014216 -0.071591 -0.122927 -0.206374 -0.207831 -0.426132 -0.668406
MP3=FULL         -0.018801   -0.020065       -0.053617 -0.010908 -0.064934         -0.201390 -0.202853 -0.424890 -0.665617
MP4=FULL   -0.008851     -0.019057       -0.168613     -0.011168 -0.066422   -0.013081 -0.070039   -0.204019 -0.205506 -0.425742 -0.669546
B2PLYP=FULL -0.000137 -0.002918 -0.007459 -0.001747 -0.006134 -0.006134 -0.006525 -0.048802 -0.048802 -0.011997 -0.016337 -0.003761 -0.020321   -0.004333 -0.021342   -0.060390 -0.060800 -0.121496 -0.190549
Quadratic configuration interaction QCISD(T)=FULL         -0.018991             -0.011127 -0.066198   -0.013016 -0.069784   -0.203494 -0.204969 -0.425556 -0.668730
Coupled Cluster CCSD=FULL         -0.018537         -0.035866 -0.053389 -0.010742 -0.064653 -0.117808 -0.012548 -0.068186 -0.119118 -0.206165 -0.202303 -0.423720 -0.663648
CCSD(T)=FULL         -0.018988           -0.054355 -0.011125 -0.066169 -0.120151 -0.013003 -0.069752 -0.121487 -0.203452 -0.204926 -0.425543 -0.668701
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 cc-pV(T+d)Z aug-cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ