Discussion
Why is a small flip angle sometimes preferred for a routine carbon spectrum?
Answer: C
With a thirty degree pulse most of the longitudinal magnetisation is left in place, so the next pulse can follow quickly without waiting five T1, and more scans accumulate in a given time. Signal per scan is lower than at ninety degrees, but signal per unit time is higher, which is what matters. Decoupling is still applied, and the Overhauser enhancement is still present and welcome. The Ernst angle formalises the best choice for a given relaxation time and repetition rate.
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