Discussion
What advantage does Zeeman correction have over the deuterium method?
Answer: B
Because the correction is made at exactly the wavelength being measured, structured background that varies across the monochromator's band is handled correctly, which the deuterium method cannot do. It needs a substantial magnet, uses the same line source, and costs considerably more. Correcting at the point of measurement rather than nearby is the more rigorous approach, and the price is the hardware. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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