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(physical chemistry)
Emission of light as a result of a chemical reaction without an apparent change in temperature.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



luminescence associated with a chemical reaction. Either the reaction products or components excited as a result of energy transfer from the reaction products may emit the light. A special case of chemiluminescence is bioluminescence—for example, the glow of decaying wood or of certain insects and marine animals.

Chemiluminescence may accompany gase-phase, liquid-phase, or heterogeneous reactions. The emission spectrum may lie in the infrared, visible, or ultraviolet region. Chemiluminescence is observed in spontaneous reactions—that is, when reactants are mixed—and in reactions that occur, for example, during an electric discharge, during electrolysis (galvanoluminescence), or upon exposure to light or to ionizing radiation.

Chemiluminescence is an example of the direct conversion of chemical energy into luminous energy. The brightness of chemiluminescence is proportional to the reaction rate and to the efficiency of light production, that is, the number of photons emitted per reaction event. The efficiency of light production approaches 100 percent for the bioluminescence of certain fireflies and approaches 25 percent for reactions in which esters of oxalic acid are oxidized by hydrogen peroxide. In certain reactions (“bright” reactions), the efficiency is about 1 percent; in other cases, it is considerably lower. Therefore, highly sensitive photoelectric equipment is used to detect chemiluminescence, especially in slow reactions.

The study of chemiluminescence makes it possible to solve subtle theoretical problems regarding the elementary event of chemical conversion, the redistribution of energy in reaction products, and the structure of molecules. In addition, reaction rates or the concentrations of substances can be measured (see). Reactions characterized by intense chemiluminescence are used in chemiluminescent light sources, which are activated by the mixing of reactants and yield luminous fluxes of —0.1 lumen per milliliter of solution. Chemiluminescense is the basis for the operation of chemical lasers.


Vasil’ev, R. F. “Mekhanizmy vozbuzhdeniia khemiliuminestsentsii.” Uspekhi khimii, 1970, vol. 39, issue 6, p. 1130.
Khemiliuminestsentnye metody issledovaniia medlennykh khimicheskikhprotsessov. Moscow, 1966.
Chemiluminescence and Bioluminescence. New York-London, 1973.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
It should be remembered that the advantage of chemiluminescence as an analytical screening technique is its extreme sensitivity.
The CLI values that expressed the relative capacity of phagocytic cells to be stimulated by PMA were significantly higher (p [less than] [10.sup.-5]) in the total EP population (and in both groups Inf and N-Inf) than those measured in CS at the 1/10 dilution, whatever the chemiluminescence reagent (Table V).
The researchers are confident that their new method can be used more broadly to develop specific chemiluminescence probes for other bacteria.
Nearly any flowthrough detector for drenched chemical reactions could be used in FIA, most common is UV/Visible spectrophotometry [9], chemiluminescence (CL) [5], electrochemiluminescence (ECL) [10] and others [11, 12].
The CTC directly calculates the instantaneous 3D chemiluminescence field using multiple measurements (in the form of camera images) that are obtained from different angles [theta] around the object, as depicted in Figure 1.
Chemiluminescence assay is anticipated to witness highest growth over the forecast period due to its high sensitivity and specificity.
Other chemiluminescence based assa-ys like LIAISON assay by Diasorin and ARCHITECT by Abbot are also available.
Compared to these laser-based diagnostic techniques, the chemiluminescence technique is relatively simple and cheap since there is no laser equipment.
In this research, the increase in sensitivity and decrease in diagnose limit of chemiluminescence system was made possible by producing gold/silver nanoalloy as the catalyst and introducing it in combination with Amplex red.