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

For CH3CHCH3+ (Isopropyl 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) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL -0.001361 -0.004869 -0.004869 -0.003902 -0.013995 -0.015237 -0.015411 -0.055416 -0.056417 -0.023776 -0.065840 -0.050831 -0.007845 -0.047591 -0.084831 -0.008851 -0.055842 -0.087021
MP3=FULL         -0.013850   -0.015269       -0.068531 -0.053301 -0.007428 -0.049082        
MP4=FULL   -0.004671     -0.013904       -0.059011   -0.069170   -0.007405 -0.049487   -0.008403 -0.058414  
B2PLYP=FULL -0.000414 -0.001459 -0.001459 -0.001167 -0.004142 -0.004498 -0.004550 -0.015868 -0.016169 -0.006934 -0.018952 -0.014574 -0.002341 -0.013796   -0.002636 -0.016136  
Quadratic configuration interaction QCISD(T)=FULL         -0.013867           -0.069038   -0.007367 -0.049311   -0.008358    
Coupled Cluster CCSD=FULL         -0.013707         -0.023815 -0.068383 -0.053250 -0.007253 -0.048866 -0.088370 -0.008231 -0.058647  
CCSD(T)=FULL         -0.013871             -0.053580 -0.007367 -0.049313 -0.087407 0.010004   -0.089801
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