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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.
AAS (Angle-Angle-Side) AAS, or angle-angle-side, is another way to prove congruence by ASA, it is just disguised a bit. The measure of the third angle in a triangle can easily be calculated if two of the angle measures are known. With AAS, the measures of two angles are known along with the measure of a side not included by the angles.