Electronic excitation energy differences

Electronic excitation energies can be approximated by differences between filled and empty orbital energies. Again, however, a more accurate treatment requires a separate calculation for the ground and excited state (represented by two different Slater determinants). 

In the following scheme the difference between intra- and inter-molecular electronic excitation energy transfer is summarized (as formulated in 2>) ... 

The definitive resonance Raman spectra obtained by Clark and Franks for [(C4H,)4N] 2Re2Cl8 and [(C4H,)4N]2Re2Br8 were particularly informative (49). The observation of resonance enhancement in the Raman spectrum recorded with excitation frequencies in the range of the lowest electronic absorption near 14,000 cm 1 not only provided useful vibrational data, but also confirmed that this electronic absorption was electric dipole allowed in accord with the S- 5 assignment. Normal Raman spectra were obtained with excitation energies differing substantially from the absorption maximum near... 

In the general discussion of the differences between thermal and photochemical reactions (section 4.1), it was mentioned that the primary product of the latter is often a high-energy product which retains a large part of the electronic excitation energy of the reactant. This is precisely the case when a biradical is formed in an unconcerted isomerization reaction, and such a biradical is of course a genuine chemical intermediate. 

When an excited alkali atom collides with a ground-state alkali atom of a different species, electronic excitation energy may be transferred either between fine-structure states of a single atom or from an excited state of one atom to that of another, as represented by the following typical equations ... 

Electron energy loss spectroscopy (EELS) has been a valuable technique for exploring electronic excitation in different systems [1]. In EELS an electron beam is passed through a cell containing the target system and the... 

Once wave functions of the type shown in Equation (1.18) are known, the electronic excitation energies A " may be calculated from Equation (1.8) as the enei y difference between the ground state described by and the excited state described by I P ... 

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