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

For HN3+ (Hydrazoic acid 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 daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.000598 -0.005250 -0.005250 -0.003426 -0.009920 -0.010072 -0.010700 -0.055915 -0.056056 -0.025017 -0.067407 -0.051221 -0.006676 -0.040880 -0.086915 -0.007400 -0.048039   -0.007691  
MP3=FULL         -0.009419   -0.010200       -0.069446 -0.052984 -0.006186 -0.041364         -0.007184  
MP4=FULL   -0.004935     -0.009400       -0.057673   -0.069859   -0.006137 -0.041434   -0.006854 -0.049080   -0.007137 -0.051602
B2PLYP=FULL -0.000173 -0.001554 -0.001554 -0.001011 -0.002915 -0.002958 -0.003140 -0.015872 -0.015914 -0.007175 -0.019233 -0.014546 -0.001962 -0.011788   -0.002178 -0.013801   -0.002261  
Quadratic configuration interaction QCISD(T)=FULL         -0.009314           -0.069625   -0.006062 -0.041092   -0.006781 -0.048693   -0.007059  
Coupled Cluster CCSD=FULL         -0.009172         -0.024804 -0.068851 -0.052712 -0.005951 -0.040656 -0.089011 -0.006651 -0.048246   -0.006925 -0.050761
CCSD(T)=FULL         -0.009324           -0.069610 -0.053075 -0.006067 -0.041124 -0.090005 -0.006784 -0.048731 -0.091476 -0.007062 -0.051264
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