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

For CuF2 (Copper difluoride)

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 aug-cc-pVDZ aug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.005614 -0.058954 -0.058954 -0.059609 -0.074575 -0.074575 -0.141188 -0.454905 -0.454905 -0.128872 -0.232057 -0.222453 -0.453088 -0.248363 -0.466157
MP3=FULL         -0.059897   -0.107311       -0.175218 -0.171072 -0.386341    
MP4=FULL   -0.054299     -0.074226       -0.439663     -0.214677 -0.444348 -0.241450 -0.459186
B2PLYP=FULL -0.002593 -0.017752 -0.017752 -0.018615 -0.023491 -0.023491 -0.043826 -0.135365 -0.135365 -0.039083 -0.071141 -0.069010 -0.135609 -0.076509 -0.139331
Quadratic configuration interaction QCISD(T)=FULL         -0.068053             -0.195916 -0.419575 -0.220666 -0.433753
QCISD(TQ)=FULL         -0.066398   -0.122644         -0.194707 -0.427197 -0.229811  
Coupled Cluster CCSD=FULL         -0.065606         -0.120312 -0.201179 -0.192093 -0.414366 -0.216661 -0.427746
CCSD(T)=FULL         -0.067994           -0.203150 -0.196172 -0.420168 -0.220967 -0.434268
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 aug-cc-pVDZ aug-cc-pVTZ