What component in atomic absorption spectrophotometry is used to convert ions into atoms?

• A. Monochromator
• B. Detector
• C. Atomizer (nebulizer/graphite furnace)
• D. Chopper

Answer: (C)

In atomic absorption spectrophotometry, atoms in the vapor phase must absorb light at specific wavelengths. The step that makes this possible is atomization—the process of converting dissolved ions into free, gaseous atoms. The atomizer, typically a flame or a graphite furnace (often described as the nebulizer/graphite furnace assembly), provides the high temperature or rapid heating needed to desolvate, vaporize, and atomize the sample. Once free atoms are present, they can absorb light at their characteristic wavelengths, producing the measurable signal. The monochromator then isolates the wavelength of interest, the detector records the light that passes through, and a chopper is not used to perform the atomization itself.