Potential energy diagram electronic transitions

Figure 5.1. Potential energy diagram depicting electron transition for an excimer laser having an emission at 248 nm (from Pummer41).

Fig. 31. Schematic potential energy diagram for interaction between absorbate A and a surface M. G is the ground state of the molecular complex, M" + A is an ionic state, (M + A) is an antibonding state, M + A is a state where the adsorbate is excited and the substrate is in its ground state, M + A is a state where the substrate is excited and the adsorbate is in its ground state. Possible electronic transitions from the ground state G to the various excited states are indicated by the shaded Franck-Condon region. Electron bombardment can presumably excite any of these states. (From Ref. )...

In the potential energy diagram a radiative transition is shown by a vertical arrow since the motion of the nuclei can be neglected within the time of an electronic transition. The reorganization of nuclear geometry is shown by horizontal arrows, as seen in Figure 3.12. 

Figure 28-1 Schematic potential-energy diagram for ground and excited electronic states of a diatomic molecule A—B. The horizontal lines represent vibrational energy levels (Section 9-7). Absorption of a photon induces a transition from ground-state singlet to excited singlet...

Figure 3.14 Potential energy diagram showing how an electronic transition takes place between vibrational levels of the ground and excited states. The illustration also demonstrates how the width and asymmetry of an absorption band changes at elevated temperature as a result of increased thermal population of vibrational levels of the ground electronic state (— low temperature -------elevated temperature). (Modified from...

Thermal broadening of an electronic transition results from the population of additional vibrational levels of the electronic ground state illustrated by the potential energy diagram in fig. 3.14. Conversely, spectral features may be narrowed, and better resolution of absorption bands achieved, by performing crystal field spectral measurements at low temperatures. Under these conditions, vibrational peaks may contribute to fine structure observed on electronic absorption bands of transition metal-bearing phases, particularly in low temperature spectra. 

Figure 1 Hush diagram for intervalence transfer within a class II mixed-valence ion. The dotted lines correspond to diabatic potential energy surfaces. The solid lines are adiabatic potential energy surfaces. Electron transfer can occur either optically (vertical transition with energy, Eop, equaling A) or thermally by moving along the lower adiabatic surface. In the diabatic limit, the barrier height for thermal electron...

---