Correlation energy diagrams giving

SiM 3 Fig. 1. Correlation diagram giving electron attachment energies (AE) and ionization potentials (IP) of a-,—SiMe3 and jS-silyl substituted ethylenes... 

We point out that on the left hand side of Eq. (129) we have diagrams with no open path (these give us a scalar quantity) and diagrams with open paths (these correspond to operators). Therefore, if the left hand side of Eq. (129) is to be compared to the scalar quantity E - (d>0IH l0), only the diagrams with no open paths can be taken into account. Hence, for the correlation energy we can write... 

Figure 8.15. Configuration coordinate diagram for the formation of a D -D pair. Exchange of an electron between two D centres to give a D -D pair at the same configuration costs the Hubbard energy U. The D -D centers subsequently relax to a different configuration and the overall energy is lowered by the effective correlation energy t/eff-...

Figure 2. Correlation diagram giving attachment energies of the 3d metallocenes (from ref. 7).

A. Plots of CSF Energies Give Configuration Correlation Diagrams... 

Fig. 5.4 Correlation diagram for asymmetric-top levels. Ray s asymmetry parameter k is defined as k = (2B — A — C)/(A - C). The symmetric-top levels have been taken from Fig. 5.3 thus it is assumed that A =4.5C. Note that the 1], energy is independent of B and hence gives a horizontal line.

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