title: A simple, inexpensive, and precise magic angle spinning speed controller.
abstract: Certain magic-angle spinning heteronuclear dipolar recoupling experiments using rotor-synchronized pulse trains require very precise control of the sample-spinning rate. An inexpensive spinning speed controller for use in magic-angle solid-state NMR experiments is described which can control the spinning rate to within +/- 0.2 Hz. The apparatus is based on a simple micro-controller and is self-contained. Experimental results are presented that show the importance of good spinning speed control.
authors.affiliation: Nestle Research Center, P.O. Box 44, CH-1000 Lausanne 26, Switzerland.
authors.forename: Eric
authors.initials: E
authors.lastname: Hughes
authors.forename: Terry
authors.initials: T
authors.lastname: Gullion
mesh_terms: D000409:Alanine / Q000737:chemistry*; D000465:Algorithms; D004867:Equipment Design; D019544:Equipment Failure Analysis; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation* / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*
chemical_list: D000409:Alanine