Excited state dynamics

The chemistry of excited states is intimately involved with the dynamics of the processes involved. The rate of an electronic transition between two states is proportional to the square of the matrix element ( // ). The proportionality constant governing this rate equation is given by Inplhy where p is the density of final states that can couple with the initial state, and the matrix element ff corresponds to the first order perturbation coupling of the initial and final states [Pg.7]

The observed rate constant obs for a transition between two levels is given by the zero point motion limited rate constant AiSmx, modified by a series of prohibition factors (j) for changes that occur in transitions between states [Pg.7]

The rates of electronic transitions must be considered in association with the selection rules that govern such transitions. These selection rules depend on the [Pg.7]

A small value of e (1-10 M cm ) indicates a forbidden transition, whereas a large value (10 -10 M cm ) indicates an allowed transition. [Pg.8]

A molecule in an initial state that is designated by the wavefiinction j/ can be described by the Schrodinger equation [Pg.8]

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Study 9.5c. Excited-state dynamics of oxygen atoms [8,9]... [Pg.154]

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Much less is known about excited-state dynamics of carotenoid J-aggregates, as only zeaxanthin J-aggregates have been studied to date. Only two decay components of -5 and 30ps were needed to fit the kinetics recorded at the maximum of the Sj-S band, Figure 8.8. Since no annihilation studies were carried out, the origin of these components is not known. It is likely that the 5ps lifetime is due to annihilation whereas the 30 ps component corresponds to the. S, lifetime, which is even longer than that of the H-aggregates. [Pg.152]

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Besides the quenching in the excited state dynamic quenching), there exists another type of quenching (static), which takes place in the ground state and occurs due to the formation of nonemitting complexes. [Pg.194]

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