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Chemiluminescence
Description: 

A method of detection where a chemical reaction generates a small amount of light(photons).  

This method is often used to measure total NOx.  The NO2 & NO3 within the sample gas is converted to NO via a heated carbon converter.  The NO is then mixed with O3 within a reaction chamber.  The amount of photons released during the reaction is proportional to the concentration of NOx in a sample stream.