Discussion
Why does a Fourier transform instrument suit the infrared particularly?
Answer: C
Infrared sources are weak and detectors noisy, so an instrument that measures every wavelength simultaneously rather than scanning them one at a time gains enormously in signal-to-noise for the same measurement time. Its resolution is set by the mirror travel, a cell is still needed, and the moving mirror is central to it. Where the limitation is a shortage of photons, collecting all of them at once is the decisive advantage, which is why the technique displaced dispersive infrared entirely.
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