Discussion
Why did Fourier transform instruments displace dispersive ones in the infrared particularly?
Answer: D
Where photons are scarce and the detector contributes most of the noise, measuring every wavelength all the time is worth a great deal - which is exactly the infrared situation and not the ultraviolet one. Sample preparation, band width and grating manufacture are not decisive. A technique whose advantage depends on which noise source dominates will win in one spectral region and not another, and that is precisely what happened. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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