Discussion
Which condition is essential for accurate quantitative proton NMR?
Answer: C
Full recovery between pulses is the requirement: waiting about five T1 leaves less than one per cent of the magnetisation unrecovered, so every signal is measured on the same footing. Decoupling in proton work would introduce Overhauser distortions rather than remove them, spinning at high rate adds sidebands that steal area, and a short acquisition truncates the decay and distorts lineshapes. Getting the delay right is tedious but it is the single condition that most often separates a quantitative result from an approximate one.
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