Abstract
We wish to draw attention to a convenient method of capping nuclear magnetic resonance (NMR) tubes in vacuo. The method most often used involves sealing the NMR tube to a standard taper joint, attaching the joint to the evacuated system, condensing the sample into the NMR tube, cooling the tube, and sealing and removing the tube by means of a glass-blowing torch. When the tube is not sealed uniformly, the sample wobbles while being spun, which reduces resolution. In many cases, the NMR tube cannot be used again after sealing, because it is shortened.
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