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

For OH- (hydroxide anion)

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 cc-pV(T+d)Z daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.000068 -0.001760 -0.001760 -0.000996 -0.002298 -0.002416 -0.002595 -0.018600 -0.018715 -0.006668 -0.017038 -0.002146 -0.012595 -0.029844 -0.002263 -0.013715 -0.030095 -0.012595 -0.002325 -0.014032
MP3=FULL         -0.002065   -0.002356       -0.017417 -0.001942 -0.012481           -0.002119 -0.014025
MP4=FULL   -0.001616     -0.002081       -0.018995     -0.001931 -0.012546   -0.002053 -0.013676     -0.002113 -0.014007
B2PLYP=FULL -0.000019 -0.000512 -0.000512 -0.000288 -0.000664 -0.000697 -0.000749 -0.005231 -0.005264 -0.001907 -0.004799 -0.000618 -0.003614   -0.000653 -0.003930     -0.000671 -0.004019
Quadratic configuration interaction QCISD(T)=FULL         -0.002073             -0.001924 -0.012515   -0.002035 -0.013679     -0.002093 -0.014014
QCISD(TQ)=FULL         -0.002073   -0.002354         -0.001924 -0.012516 -0.030640 -0.002035 -0.013707 -0.030926      
Coupled Cluster CCSD=FULL         -0.002050         -0.006555 -0.017376 -0.001907 -0.012400 -0.030374 -0.002012 -0.013561 -0.030597   -0.002071 -0.013884
CCSD(T)=FULL         -0.002073           -0.017452 -0.001924 -0.012517 -0.030635 -0.002035 -0.013688 -0.030885   -0.002094 -0.014016
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 cc-pV(T+d)Z daug-cc-pVDZ daug-cc-pVTZ