Jablonski-type diagram

Figure 6.1. Jablonski-type diagram for pyrazine. The zero-field splittings (between tx, tV) t2) are not drawn to scale. Spin polarization ( x x x) resulting from the most probable intersystem crossing routes and part of the emission spectrum where different vibronic bands (v = /,/, k) have different zf origins are schematically indicated. (After El-Sayed.(17))...

Fig. 4. Jablonski-type diagram of cis-diarylethylene excited state processes...

Figure 1. Simplified Jablonski-type diagram of photoinduced catalytic (I), photoassisted (II), and sensitized photoreaction (III) as well as catalysed photolysis (IV). (MLn i + L) represents coordinatively unsaturated species, free ligands as well as ligands and/or coordination compounds with changed formal oxidation number generated by photo-redox and/or photodissociation reactions.

Figure 22. Jablonski type diagram for Ru(bpy)3 +. See text for additional detail.

Figure 31. Jablonski type diagram invoked to rationalize the origin of temperature dependent injection quantum yield for cis-Ru pby)2(ina)2 on TiOi.

Figure 19. Jablonski-type diagram for the lower energy LF states of a C4 Rh1" complex showing reactive, radiative, and nonradiative deactivation from the lowest energy triplet state.

Fig. 1.3 Jablonski-type diagram. Abbreviations and acronyms Abs absorption, FI fluorescence, Phos phosphorescence,...

Figure 4.3 Jablonski type diagram showing the simplified energy-level arrangement for a donor-acceptor FRET pair. Intersystem crossing has been ignored, triplet states of both molecules have been omitted and the possibility of direct radiative excitation of the acceptor is neglected.

Scheme 15.1 Jablonski-type diagram schematising the overall set of deactivation processes occurring upon excitation, vr vibrational relaxation IC internal conversion ISC interystem crossing. In addition, the vibronic effect is illustrated in red, where ky and kpc are the vibrational relaxation constant and the photochemistry rate constant, respectively. This model for the fate of quanta absorbed into any vibrational level of any excited electronic singlet state excludes the occurrence of intersystem crossing...

All the information collected from spectroscopic data such as energies, lifetimes and populations of the St and T, states can be incorprorated in the construction of a Jablonski type state diagram for a molecule. Such a diagram can be of immense help in predicting the photochemical behaviour of a molecule. 

Figure 4.4 Jablonski-type energy diagrams for possible excited energy states when light interacts with matter, (a) Three possible transition pathways for return to ground state without radiation, (b) Two possible transition pathways with fluorescent light emission as final step on return to ground state, (c) Two possible transition pathways with phosphorescent light emission as final step on return to ground state.

Figure 10. Electron excitations in radicals (a) Collective representation of one-electron transitions of the A, B, and C types if denotes MO (b) LCI energy-level scheme (Jablonski diagram) for doublet and quartet states indicating why with radicals fluorescence (- - -) but not phosphorescence is observed. Spin-forbidden transitions are represented by dashed lines.

Figure 3 Type I and type II photooxidation processes with a porphyrin sensitizer illustrated with a modified Jablonski diagram. (S0 = ground singlet state, Si = first excited singlet state, S2 = second excited singlet state, T,i— ground triplet state, Ti = first excited triplet state, i.s.c. — intersystem crossing.)...

Figure 4.12 Jablonski diagram for the deactivation of a molecule by emission of E-type delayed fluorescence...

Figure 5.10 Jablonski diagram for E-type delayed fluorescence.

Fig. 1. Simplified Jablonski diagram of the photochemically initiated acetophenone type initiator decomposition.

Fig. 5.6 A schematic representation of alternative pathways for formation and decay of excited states. Singlet states are labeled S and triplet states T superscripts 0, 1, 2,. .n,. .. denote the ground state and excited states of increasing energy. Radiative processes (absorption, fluorescence, phosphorescence) are indicated with solid arrows nonradiative processes (intersystem crossing, internal conversion, etc.), with wavy arrows. Internal conversion and intersystem crossing usually proceed via excited vibrational levels of the product state. Diagrams of this type were introduced by A. Jablonski in 1935 in a paper on the mechanism of phosphorescence [295]. The horizontal axis has no physical significance...

The degradation reaction starts with the electronic excitation of the bonding electrons. The very types of excitation can be visualized in the Jablonsky diagram, which is shown in Figure 20.1. 

State energy diagrams of this type, called Jablonski diagrams , are used for the description of light absorption and of the photophysical processes that follow light excitation (vide infra) [1]. 

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