photochemical reaction


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Related to photochemical reaction: photochemical smog, photochemistry
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Noun1.photochemical reaction - a chemical reaction produced by the action of light
chemical reaction, reaction - (chemistry) a process in which one or more substances are changed into others; "there was a chemical reaction of the lime with the ground water"
light reaction - the first stage of photosynthesis during which energy from light is used for the production of ATP
References in periodicals archive ?
Based on the backgrounds, the objective of this study is to (1) examine generations of OH radicals due to a HONO photochemical reaction under different light conditions and (2) examine spatial distributions of products from the chemical reaction between OH radicals and VOCs under varied conditions.
In summary, this study provides the first instance of the induction of a vasogenic edema model of rat retina by a photochemical reaction. This model involves retinal morphological changes that are similar to the alterations that occur in human retinal edema.
The microbiological processes occurring in the photoreactor are responsible for transforming the substrates (microbial pollutants) which is consumed during the photochemical reaction and the photoinduced processes (either direct or sensitized) lead to the degradation of faecal coliform bacteria with a concomitant reduction in the bacteria's activity.
The University of North Carolina at Chapel Hill's outdoor environmental photochemical reaction chamber was used to generate exposure atmospheres.
The antenna subunits absorb the luminous energy and gets excited, and then transfers the energy to RC pigments for original photochemical reaction. It is considered that the energy transfer between the pigments can neither be attributed to molecule impact (because temperature cannot affect the original reactions), nor to the charge transfer between molecules.
He introduces the basic concepts of light and matter to begin, then explains light adsorption and electronically-excited states, the physical deactivation of excited states, radiative processes of excited states, intramolecular radiationless transitions of excited states, intermolecular physical processes of excited states, some aspects of the chemical properties of excited states, the photochemistry of alkenes and carbonyl compounds, some aspects of photochemical reaction mechanisms, semiconductor photochemistry, and an introduction to supramolecular photochemistry.
We describe the preparation and characterization of new complexes {M[(CO).sub.4][BROM-ANIS]}; {M[(CO).sub.4][BROM-DMB]}; {M[(CO).sub.4][BROM-MB]}; {M[(CO).sub.3][BROM-HB]} & {M[(CO).sub.3][BROM-o-VANI]} where (M= Cr, Mo & W), which are prepared by photochemical reaction between M(CO)6 with (BROM-ANIS), (BROM-DMB), (BROM-MB), (BROM-HB) and (BROM-o-VANI).
After three hours the light switches on for around three hours, causing a photochemical reaction which works to kill the cancer, a process known as photodynamic therapy (PDT).
The controls were treated similarly but not irradiated, in order to determine the losses not due to the photochemical reaction. The selected exposure times were 0, 2, 4 and 6 h.
This is a challenge for holographic photopolymers, where the nature of the photochemical reaction - monomer diffusion and formation of new covalent bonds--can lead to shrinkage during exposure.
When exposure time is to short the photochemical reaction is not finished and the photoactive layer is resistant to alkaline solution.

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