Discussion
Why is the burner slot aligned along the light path?
Answer: D
A slot burner ten centimetres long gives the beam a correspondingly long path through the atoms, and absorbance is proportional to path length exactly as in solution photometry. Distance from the optics, fuel economy and detector width are secondary. That the Beer-Lambert law applies to a flame as readily as to a cuvette, with the burner slot as the cell, is the connection worth making.
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