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

For F3- (trifluoride anion)

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 -0.000068 -0.005556 -0.005556 -0.003097 -0.005934 -0.005934 -0.007115 -0.055971 -0.055971 -0.014035 -0.050715 -0.006221 -0.037058 -0.006767 -0.040304
MP3=FULL         -0.005216   -0.074845                
MP4=FULL   -0.005044     -0.005329       -0.056349     -0.005600 -0.036509 -0.005895 -0.037739
Coupled Cluster CCSD=FULL         -0.005203           -0.051296 -0.005499 -0.036055 -0.006019 -0.039493
CCSD(T)=FULL         -0.005280           -0.051550 -0.005573 -0.036454 -0.006095 -0.039730
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