photochemical reaction / H2 - Br2 reaction / Kinetics of hydrogen bromine reaction / M.Sc. Sem 2

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#hydrogenbrominereaction
a chemical reaction initiated by the absorption of energy in the form of light. The consequence of molecules' absorbing light is the creation of transient excited states whose chemical and physical properties differ greatly from the original molecules.
The mechanism of a photo reaction should ideally include a detailed characterization of the primary events as outlined by the classification of photochemical reaction pathways.
The quantum yields and hence the rate constants of all relevant photophysical and photochemical processes gives information about the structure and fate of any reactive intermediates, their lifetimes and reactivities.
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Photolysis is the process by which a photochemical reaction is performed. The immediate consequence of light absorption is a primary photochemical reaction. Secondary reactions are termed subsequent chemical shifts.
Stark Einstein law of Photochemical equivalence, fundamental principle relating to light-induced chemical reactions, which states that one molecule of the material responds to each quantity of radiation that is absorbed.
The Grotthuss–Draper law (also called the Principle of Photochemical Activation) states that only that light which is absorbed by a system can bring about a photochemical change. Materials such as dyes and phosphors must be able to absorb "light" at optical frequencies.
The efficiency with which a given photochemical process occurs is given by its Quantum Yield (Φ). Since many photochemical reactions are complex, and may compete with unproductive energy loss, the quantum yield is usually specified for a particular event. Thus, we may define quantum yield as "the number of moles of a stated reactant disappearing, or the number of moles of a stated product produced, per einstein of monochromatic light absorbed.", where an einstein is one mole of photons.