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Principle components of Atomic absorption and atomic emission techniques Spectra of excited atoms differ from those of excited ions of the same atoms. An atomic absorption spectrometer is simply an instrument in which these basic principles are applied to practical quantitative analysis. Atomic absorption absorption spectroscopy (AA or AAS) is one of the commonest instrumental methods for analyzing for metals and some metalloids.Argon sample heated in an sample plasma argon plasma (4000-6000oC). Page 5. 5. Flame and Plasma Emission Spectroscopy are based upon those particles that are ATOMIC ABSORPTION SPECTROSCOPY Principle: The basis of atomic absorption spectrometry (AAS) is the absorption of discrete wavelengths of light by ground