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

For SeF2 (Selenium difluoride)

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 -0.000208 -0.007372 -0.014307 -0.014584 -0.038214 -0.038214 -0.040452 -0.413392 -0.413392 -0.110756 -0.467183 -0.104348 -0.013828 -0.075002 -0.146634 -0.017327 -0.083916 -0.149712 -0.018194 -0.088465
B2PLYP=FULL -0.000069 -0.002178 -0.004340 -0.004328 -0.011878 -0.011878 -0.012544 -0.121773 -0.121773 -0.034343 -0.137650 -0.030583 -0.004198 -0.022245   -0.005248 -0.024770   -0.005508 -0.026072
Quadratic configuration interaction QCISD(T)=FULL         -0.037321           -0.439262   -0.012838 -0.071099   -0.016265 -0.079593   -0.017093 -0.083854
Coupled Cluster CCSD=FULL         -0.036387         -0.103747 -0.433907 -0.095557 -0.012369 -0.069142 -0.137860 -0.015700 -0.077671 -0.140746 -0.016503 -0.081932
CCSD(T)=FULL         -0.037325           -0.439108 -0.097642 -0.012845 -0.071055 -0.140484 -0.016271 -0.079560 -0.143312 -0.017098 -0.083823
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