Discussion
Why are NMR sample tubes made to close dimensional tolerance?
Answer: D
Any variation in wall thickness or straightness distorts the field across the sample and no shim can fully compensate, so precision tubes are worth their price for high resolution work while cheap ones cost resolution. Spinning stresses are modest at twenty hertz, borosilicate glass is transparent to the radiofrequencies used, and volume calculation is not a routine concern. A scratched, bent or cheap tube is a frequent and easily missed cause of a spectrum that refuses to shim properly.
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