Energy level diagram first excited singlet state

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 3-14 Luminescence energy-level diagram of typical organic molecule. So is the ground level singlet state S is the first excited singlet state A is the absorption process T is the first excited triplet state and RVD is the radiationless vibrational deactivation. Q is quenching of the excited singlet or triplet state. F is the fluorescence process from the first excited singlet state. P is the phosphorescence process from the first excited triplet state. RC is the radiationless crossover from the first excited singlet state to the first excited triplet state.

The Jablohski diagram plays an important role in molecular spectroscopy (Fig. 8.19). It shows three energy levels the ground state (G), the first excited singlet state (S), and the metastable in-between state. Later on researchers identified this metastable state as the lowest triplet (T). ... 

Fig. 13 Qualitative molecular orbital energy level diagram of the dimer d orbitals with the 14 electrons showing the electronic configuration 525 27i47i 4o2 (singlet) and the first excited state 828 2it4it 4a1CT 1 (triplet)...

Figure 1 Energy-level diagram showing transitions by light absorption and deactivation pathways for an organic molecule. S0, ground state Sl5 first singlet excited state Tx, first triplet excited state VL, vibrational levels.

Delayed fluorescence from a very-short-lived upper excited singlet state populated by hetero-TTA has been observed for the first time using the system A = anthracene and X = xanthone (Nickel and Roden, 1982). An energy-level diagram for this system is shown in Figure 5.32, and the corrected spectrum of the delayed fluorescence of anthracene and xanthone in trichlorotrifluoroe-thane is depicted in Figure 5.33. The band at 36,000-40,000 cm has been assigned to the delayed fluorescence of anthracene produced by Tf +... 

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 ...

---