atomic absorption spectrophotometry
noun
: a method of spectrophotometry that relies on the absorption of specific frequencies of light by atoms in order to identify the chemical composition of a sample
… the venerable technique of emission spectrometry has been overshadowed in recent years by rapid advances in the related field of atomic absorption spectrophotometry. 
Chemical & Engineering News, 19 Mar. 1979
Chemical & Engineering News, 19 Mar. 1979called also absorption spectrophotometry
Word History
First Known Use
1961, in the meaning defined above
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