Normally, you should have 0.4-0.5ml of solvent, which is ca. 3-4cm tall in the NMR tube. If you have less than 3cm of sample, please follow these steps: – instead of rsh shims.best, do rsh shims.short – always lock after you do rsh – You can try topshim, but watch if the lock line gets … Continue reading What to do if you have insufficient solvent