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

For H2Br+ (protonated hydrogen bromide)

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) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.000114 -0.003319 -0.010244 -0.010615 -0.026690 -0.027736 -0.028229 -0.393646 -0.394510 -0.082670 -0.441430 -0.065662 -0.008628 -0.047879 -0.082510 -0.011182 -0.053344 -0.084975 -0.011630 -0.055620
MP3=FULL         -0.025134   -0.026652       -0.391977 -0.054914 -0.007591 -0.041381         -0.010268 -0.048245
MP4=FULL   -0.003165     -0.025942       -0.371139   -0.415219   -0.008230 -0.045823   -0.010746 -0.051025   -0.011181 -0.053189
B2PLYP=FULL -0.000039 -0.001005 -0.003128 -0.003113 -0.008180 -0.008490 -0.008635 -0.115577 -0.115832 -0.025481 -0.129652 -0.019528 -0.002654 -0.014348   -0.003424 -0.015912   -0.003559 -0.016583
Quadratic configuration interaction QCISD(T)=FULL         -0.025795           -0.408685   -0.008094 -0.044465   -0.010550 -0.049533   -0.010975 -0.051650
QCISD(TQ)=FULL         -0.025665   -0.027192           -0.007985 -0.043748 -0.072839 -0.010395 -0.049635      
Coupled Cluster CCSD=FULL         -0.025216         -0.077016 -0.404352 -0.057484 -0.007695 -0.042805 -0.073719 -0.010042 -0.047821 -0.075962 -0.010450 -0.049915
CCSD(T)=FULL         -0.025773           -0.408531 -0.059252 -0.008083 -0.044386 -0.075743 -0.010531 -0.049447 -0.078001 -0.010956 -0.051562
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ daug-cc-pVDZ daug-cc-pVTZ