Important parameters in laser-induced fluorescence

The overall aim in the investigation of reaction dynamics of chemical processes is to obtain a detailed picture of the path (or paths) that links reactants to products in a chemical reaction, as will be discussed in great detail in Parts 4 and 5. The dynamics of a reaction can be characterized by measurements of some or all of the following important aspects (not a complete list)  

These questions may be addressed if reactions are studied with product state resolution, under single 

Product quantum state information derived from laser-induced fluorescence measurements 

In addition to the energy-level structure deduced from the fluorescence line positions, one can 

By scanning the probe laser over one or more rotational branches of the product, the relative intensities of the lines in this excitation spectrum may be used to determine product rotational (and/or vibrational) state distributions. In order to arrive at fully quantitative answers, corrections have to be made for relative transition probabilities, fluorescence lifetimes of the excited state, and any wavelength-dependent detection functions (such as the detection system spectral response). But once this has been done, one can deduce the ground state distribution function(s) by examining the so-called excitation spectrum of a molecular species. For thermal equilibrium conditions, the level population /V, can be described using a Boltzmann distribution function with temperature as the most important parameter in its most general form this is 

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