Photofragmentation processes

The information available is discussed in light of the effects of excitation energy and the environment on the photofragmentation process of several transition metal cluster complexes. The photochemical information provides a data base directly relevant to electronic structure theories currently used to understand and predict properties of transition metal complexes (1,18,19). 

Balint-Kurti, G.G., Dixon, R.N., and Marston, C.C. (1990). Time-dependent quantum dynamics of molecular photofragmentation processes, J. Chem. Soc., Faraday Trans. 86, 1741-1749. 

It was assumed in the preceding chapters that optical transitions between bonded states of molecules take place with no change in their chemical composition. Photodissociation and photoionization form a general class of photofragmentation processes in collisions between a molecule and a photon which lead to simple chemical reactions of disintegration into atomic or molecular fragments, or into ions and electrons. 

No spectrum, no matter how simple, is dynamics-free. No dynamical process, no matter how complex, fails to reveal its essential characteristics in one or a series of well designed spectroscopic experiments. The essential unity of spectrum and dynamics, of patterns of eigenstates and dynamical mechanisms, of simple few-level perturbations and multi-continua photofragmentation processes is the subject of this book. 

Table 1 Common examples of photoinitiators that undergo primary photofragmentation processes...

The TBN excited state is of a" symmetry where the n lobes are perpendicular to the molecule rotation plane. The conservation of symmetry would cause the antisymmetric A doublet component of the NO fragment to be highly populated relative to the symmetric A doublet component provided that the dissociation process is fast and planar. An indication to the planarity of the TBN photofragmentation process is found from the ali ment factor derived in the next section. It has been shown that in a state the Q lines probe the H" A doublet levels... 

J. W. Gallagher, C. E. Brion, J. A. R. Samson, and P. W. Langhoff, Absolute cross sections for molecular photoabsorption, partial photoionization, and ionic photofragmentation processes, Journal of Physical and Chemical Reference Data, vol. 17, no. 1, pp. 9-153, 1988. 

Utilized as photoinitiator. This is not unexpected, as AQ is known to be a photoinitiator that produces radicals under illumination by hydrogen abstraction reactions, while IRG is operative with a photofragmentation process (45),... 

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