There is an extensive use of Laser based diagnostic techniques in the quantitative and qualitative analysis of species present in a combustion system. Why Atomic absorption spectroscopy is not preferred for the analysis?
Emission methods allow for the detection of much smaller concentrations/intensities. If you try to measure absorption, you have an extremely small change on a big signal while with emission you have a signal in a region in which there is hopefully nothing except the baseline.
Dear Nikhil Gaur ,
in addition to the aspects mentioned by Jürgen Weippert ,
in the case of emission based spectroscopy you need to have access to the sample only from one side.
In absorption (transmission) based spectroscopy you need access to two opposite lying sides of the sample, often in combination with additional windows of appropriate material.
Best regards
G.M.
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