Electronically excited molecule energy level diagrams

Energy level diagram for a molecule showing pathways for deactivation of an excited state vr Is vibrational relaxation Ic Is Internal conversion ec Is external conversion, and Isc Is Intersystem crossing. The lowest vibrational energy level for each electronic state Is Indicated by the thicker line. 

Fig. 1. Schematic energy-level diagram for a dye molecule. Electronic states Sq = ground singlet state = first excited singlet state S2 = second excited singlet state Tj = first excited triplet state T2 = second excited triplet state EVS = excited vibrational states. Transitions A = absorption excited states ...

Figure 4.4 Energy-level diagram showing how the electronic and vibrational energy levels in the ground-state (S0) and first excited-state (Si) anthracene molecule are related to the absorption and fluorescence emission spectra...

The fluorescence and phosphorescence spectra of a complex molecule are generally discussed by reference to an energy level diagram such as that shown in Figure 1. Absorption of light raises the molecule from the ground state to one of the upper electronically excited singlet states. At... 

Figure 11.25 The electronic ground state and a few excited states of a hypothetical molecule. Above, orbital energy-level diagrams specify symmetry properties and illustrate orbital occupancies for various states the molecular orbital set is the same for each state in this approximation. Below, the states are shown on an energy scale. Each state function is a product of orbital functions for the electrons, with state symmetry determined by multiplying the symmetries of the electrons (+1 for S, — 1 for A).

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 1. Schematic energy level diagram of an organic dye molecule illustrating radiative (full line) and radiationless transitions (dotted line). S0 and. S, are the electronic ground and excited states, T, is the triplet state and /cjsc is the intersystem crossing rate, t, and t3 are the life times of the states S, and Tj, respectively.

Figure 1. A simplified energy level diagram for the excitation by photons hv) of a molecule. Sq, S, and S2 represent singlet electronic states of the molecule. T, and indicate the first and higher triplet states of the molecule respectively. The molecule can relax back to the ground state from either S, or T, radiatively or nonradiatively. and k ...

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