Introduction to Atomic Absorption Spectroscopy AAS

Since the relationship between energy and wavelength is an inverse one, 

In practice, not all elements are detected with equal ease (some elements are detected more efficiently than others). The probability of hght absorption of a particular wavelength ( ) per unit volume is a function of the total number of free atoms in that volume and a constant which is characteristic of a particular transition. This constant (termed the oscillator strength) 

The natural line width of an atomic absorption line is extremely narrow an estimate of this width can be obtained from the uncertainty principle  

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