Excimer interaction diagram

Figure 8 Energy level diagram explaining excimer formation, (a) Interaction between two ground state molecules results in no net stabilization of dimer, (b) Interaction of ground state (M) and electronically excited molecules (M ) results in an energetically stabilized excited state complex or excimer (E ). Emission from M and E is denoted by hv(M ) and hv(E ), respectively.

Figure 14. Schematic diagram of the stabilization of the CDMA excimer due to exciton resonance interaction. An ideal sandwich-like conformation with opposite orientation of the two monomers is assumed for the excimer. The values of the excited-state energies and the corresponding transition dipole moments were taken from Ref [33cj. The exciton splitting of the Lb state is only 39 cm owing to the low transition dipole moment corresponding to the Lb <— So emission. The much larger A/nu value for the La — So fluorescence makes the exciton splitting of the La state the dominant stabilization. The in-phase and the out-of-phase combinations of the exciton resonance states are labeled L and L, respectively. The unknown contributions of the charge resonance interaction are indicated by a question mark. Reproduced with permission from Ref [92a].

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