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J Magn Reson. 2010 Oct;206(2):183-9. doi: 10.1016/j.jmr.2010.07.001. Epub 2010 Jul 29.

Pneumatic switched angle spinning NMR probe with capacitively coupled double saddle coil.

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Department of Chemistry, University of California, Irvine, CA 92697-2025, United States.


Switched angle spinning (SAS) experiments can be used for generating isotropic-anisotropic correlations in oriented samples in a single experiment. In order for these methods to become widespread, specialized hardware is required. Here we describe the electronic and mechanical design and performance of a double-resonance SAS probe. Unlike many previous SAS probe implementations, the focus here is on systems where the dipolar couplings are partially averaged by molecular motion. This probe has a moving double saddle coil capacitively coupled to the stationary circuit. Angle switching is accomplished by a steam engine-type pneumatic mechanism. The speed and stability of the switching hardware for SAS experiments are demonstrated using spectra of model compounds.

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