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

For BeF- (Beryllium monofluoride 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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pV(T+d)Z
Moller Plesset perturbation MP2=FULL -0.000445 -0.002770 -0.002770 -0.002031 -0.006349 -0.006349 -0.006823 -0.034057 -0.034057 -0.009370 -0.030276 -0.003168 -0.020014 -0.052883 -0.003894 -0.025838 -0.053974 -0.020014
MP3=FULL         -0.006268   -0.058133                      
MP4=FULL   -0.002590     -0.006348       -0.035776     -0.002941 -0.020168   -0.003673 -0.026686    
Coupled Cluster CCSD=FULL         -0.006185           -0.032056 -0.002853 -0.019882 -0.055095 -0.003578 -0.026449 -0.056286  
CCSD(T)=FULL         -0.006306           -0.032203 -0.002905 -0.020145 -0.055630 -0.003641 -0.026710 -0.056824  
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