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1 Atomic absorption spectroscopy (AAS) : A technique used to identify the presence and concentration of substances by analysing the spectrum produced when a substance is vaporised and absorbs certain frequencies of light.2  AAS is used particularly for detecting the concentrations of metal ions in solutions. Atomic absorption spectroscopy (AAS) : A technique used to identify the presence and concentration of substances by analysing the spectrum produced when a substance is vaporised and absorbs certain frequencies of light.
Army and Air Force Exchange Service. The Army & Air Force Exchange Service (Exchange) or AAFES, is the retailer on U.S. Army and Air Force installations worldwide. The Exchange is headquartered in Dallas, Texas, and its Director/chief executive officer is Tom Shull.