Decay of large molecules

To conclude this discussion we have summarized in Table II the general features of inhomogeneous broadening and radiative decay of large molecules. 

Freed, K. F., and Jortner, J., 1970, Multi ionon processes In the nooratfistive decay of large molecules, J. Chem. Phys. 52 6272-6291. 

The main conclusions of the Bixon-Jortner9-11 treatment of the radiative decay of large and medium-size molecules are ... 

In a real sample of large molecules, an observed decay will not be Eq. (3.44), but some thermal average of Eq. (3.44) over JQ and K0. That is, the observed decay will be... 

Rhodes, W. (1983). Nonradiative relaxation and cprantum heats in the radiative decay dynamics of large molecules. J. Phys. Chem. 87,30. 

Chemistry is concerned with the study of molecular structures, equilibria between these structures and the rates with which some stractures are transformed into others. The study of molecular structures corresponds to study of the species that exist at the minima of multidimensional PESs, and which are, in principle, accessible through spectroscopic measurements and X-ray diffraction. The equihbria between these structures are related to the difference in energy between their respective minima, and can be studied by thermochemistry, by assuming an appropriate standard state. The rate of chemical reactions is a manifestation of the energy barriers existing between these minima, barriers that are not directly observable. The transformation between molecular structures implies varying times for the study of chemical reactions, and is the sphere of chemical kinetics. The journey from one minimum to another on the PES is one of the objectives of the study of molecular dynamics, which is included within the domain of chemical kinetics. It is also possible to classify nuclear decay as a special type of unimolecular transformation, and as such, nuclear chemistry can be included as an area of chemical kinetics. Thus, the scope of chemical kinetics spans the area from nuclear processes up to the behaviour of large molecules. 

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