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

For NH(C2H5)2 (diethylamine)

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 -0.002084 -0.008445 -0.008445 -0.006584 -0.022523 -0.024489 -0.024938 -0.093142 -0.094690 -0.043672 -0.085727 -0.013233 -0.079098 -0.015273 -0.093607
MP3=FULL         -0.022167   -0.024588       -0.089607 -0.012489 -0.081357    
MP4=FULL   -0.008087     -0.022251       -0.098712     -0.012446 -0.081865    
B2PLYP=FULL -0.000629 -0.002521 -0.002521 -0.001962 -0.006652 -0.007214 -0.007347 -0.026616 -0.027080 -0.012669 -0.024536 -0.003932 -0.022911 -0.004536 -0.027028
Quadratic configuration interaction QCISD(T)=FULL         -0.022196             -0.012375 -0.080843    
Coupled Cluster CCSD=FULL         -0.021954         -0.044009 -0.089489 -0.012205 -0.081011    
CCSD(T)=FULL         -0.022203           -0.090036 -0.012376 -0.043121    
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