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

For NH2COOH (Carbamic acid)

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 -0.000804 -0.007125 -0.007125 -0.004628 -0.013914 -0.014432 -0.015125 -0.075310 -0.075726 -0.032612 -0.068778 -0.009436 -0.056814 -0.011029 -0.065613
MP3=FULL         -0.013280   -0.014501       -0.070985 -0.008752 -0.057510    
MP4=FULL   -0.006729     -0.013331       -0.077775     -0.008721 -0.057555 -0.010308 -0.067081
B2PLYP=FULL -0.000241 -0.002101 -0.002101 -0.001363 -0.004083 -0.004233 -0.004438 -0.021345 -0.021469 -0.009406 -0.019521 -0.002767 -0.016396 -0.003237 -0.018875
Quadratic configuration interaction QCISD(T)=FULL         -0.013286             -0.008680 -0.059580 -0.010256 -0.066962
QCISD(TQ)=FULL         -0.013025   -0.015992         -0.008716   -0.010529  
Coupled Cluster CCSD=FULL         -0.013152           -0.070849 -0.008583 -0.057109 -0.010140 -0.066552
CCSD(T)=FULL         -0.013291           -0.071216 -0.008683 -0.057542 -0.010258 -0.066632
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