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

For BeN+ (Beryllium mononitride cation)

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
Moller Plesset perturbation MP2=FULL -0.000409 -0.002303 -0.002303 -0.001773 -0.006398 -0.006398 -0.006675 -0.032690 -0.032690 -0.010739 -0.029716 -0.002634 -0.020105 -0.048381 -0.003628 -0.024411 -0.049096
MP3=FULL         -0.006461   -0.006741       -0.031849 -0.002514 -0.020781        
MP4=FULL         -0.006481       -0.034909     -0.002511 -0.020803   -0.003499 -0.025693  
B2PLYP=FULL -0.000143   -0.000699 -0.000541   -0.001923   -0.009406 -0.009406 -0.003143 -0.008552 -0.000792 -0.005898   -0.001085 -0.007141  
Quadratic configuration interaction QCISD(T)=FULL         -0.006426             -0.002491 -0.020671   -0.003357 -0.025571  
QCISD(TQ)=FULL         -0.006891   -0.006669         -0.003625 -0.020647 -0.051554 -0.003402 -0.025549 -0.052313
Coupled Cluster CCSD=FULL         -0.006338         -0.010779 -0.031901 -0.002537 -0.020529 -0.051144 -0.003288 -0.025407 -0.051904
CCSD(T)=FULL         -0.006438           -0.032116 -0.002497 -0.020701 -0.051557 -0.003404 -0.025598 -0.052317
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