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

For NH2CN (cyanamide)

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 -0.000801 -0.005143 -0.005143 -0.003607 -0.012004 -0.012386 -0.012835 -0.056350 -0.056679 -0.026022 -0.051540 -0.007141 -0.043076 -0.008208 -0.050509
MP3=FULL         -0.011651   -0.012495       -0.053541 -0.006667 -0.044016    
MP4=FULL   -0.004883     -0.011636       -0.058663     -0.006630 -0.044115 -0.007688 -0.052115
B2PLYP=FULL -0.000241 -0.001528 -0.001528 -0.001071 -0.003548 -0.003658 -0.003790 -0.016060 -0.016156 -0.007561 -0.014698 -0.002117 -0.012523 -0.002434 -0.014628
Quadratic configuration interaction QCISD(T)=FULL         -0.011617             -0.006599 -0.044082 -0.007653 -0.052106
QCISD(TQ)=FULL         -0.011619   -0.012452         -0.006592 -0.044084 -0.007642 -0.052087
Coupled Cluster CCSD=FULL         -0.011492           -0.053418 -0.006507 -0.043694 -0.007549 -0.051738
CCSD(T)=FULL         -0.011624           -0.053743 -0.006602 -0.044089 -0.007655 -0.052116
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