Discussion
What is atomic fluorescence spectroscopy based on?
Answer: B
In fluorescence the atoms absorb the source's line and then radiate, and the emitted light is measured at right angles to the beam so the source itself is not seen. Thermal emission is flame photometry, elastic scattering is a background, and continuum absorption is not the arrangement. Measuring against a dark background rather than as a small difference between two large signals is what gives the technique its very low detection limits. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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