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

For CH3BH2 (methylborane)

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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL -0.001044 -0.002850 -0.002850 -0.002557 -0.009238 -0.010055 -0.010198 -0.035700 -0.036206 -0.013541 -0.032863 -0.004635 -0.029512 -0.053839 -0.005425 -0.034625 -0.055196
MP3=FULL         -0.009297   -0.010258       -0.034830 -0.004432 -0.030710        
MP4=FULL   -0.002766     -0.009338       -0.038304     -0.004412 -0.030937   -0.005212 -0.036580  
B2PLYP=FULL -0.000320 -0.000863 -0.000863 -0.000773 -0.002758 -0.002993 -0.003034 -0.010279 -0.010434 -0.003990 -0.009470 -0.001395 -0.008613   -0.001633 -0.010076  
Quadratic configuration interaction QCISD(T)=FULL         -0.009324             -0.004390 -0.030887   -0.005187 -0.036530  
QCISD(TQ)=FULL         -0.009327   -0.010273         -0.004386 -0.031167 -0.057102 -0.005181 -0.036466  
Coupled Cluster CCSD=FULL         -0.009218         -0.013583 -0.034839 -0.004319 -0.030594 -0.056652 -0.005105 -0.036211 -0.057994
CCSD(T)=FULL         -0.009326           -0.035045 -0.004390 -0.030886 -0.057166 -0.005186 -0.036527 -0.058619
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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ