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

For Cl+ (Chlorine atom 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) 6-311+G(3df,2pd) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL -0.000054 -0.004086 -0.011417 -0.002476 -0.009568 -0.009568 -0.010208 -0.048725 -0.048725 -0.018607 -0.093836 -0.093836 -0.026741 -0.005524 -0.032243 -0.061584 -0.006353 -0.033335 -0.062040
MP3=FULL   -0.003791 -0.010788 -0.002307 -0.009052 -0.009052 -0.009671 -0.048513 -0.048513 -0.017301     -0.026074 -0.005056 -0.031047   -0.005837 -0.032129  
MP4=FULL -0.000054 -0.003906 -0.010804 -0.002378 -0.009034 -0.009034 -0.009661 -0.048810 -0.048810 -0.017206 -0.092605 -0.092605 -0.026315 -0.005074 -0.031417 -0.060949 -0.005880 -0.032521 -0.061408
B2PLYP=FULL -0.000017 -0.001239 -0.003435 -0.000749 -0.002875 -0.002875 -0.003065 -0.014046 -0.014046 -0.005570     -0.007845 -0.001677 -0.009608   -0.001925 -0.009924  
Quadratic configuration interaction QCISD(T)=FULL         -0.009022   -0.009648             -0.005070 -0.031365 -0.060834 -0.005877 -0.032465 -0.061292
QCISD(TQ)=FULL         -0.009016   -0.009642             -0.005060 -0.031282 -0.060702 -0.005859 -0.032378 -0.061158
Coupled Cluster CCSD=FULL   -0.003807 -0.010600 -0.002323 -0.008875 -0.008875 -0.009491 -0.048354 -0.048354 -0.016831 -0.091457 -0.091457 -0.025920 -0.004941 -0.030745 -0.059821 -0.005722 -0.031823 -0.060267
CCSD(T)=FULL   -0.003883 -0.010790 -0.002366 -0.009020 -0.009020 -0.009647 -0.048787 -0.048787 -0.017135 -0.092434 -0.092434 -0.026297 -0.005068 -0.031351 -0.060812 -0.005873 -0.032450 -0.061269
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) 6-311+G(3df,2pd) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ