Design and construction of a contactless mobile RF coil for double resonance variable angle spinning NMR.
Variable angle spinning (VAS) experiments can be used to measure long-range dipolar couplings and provide structural information about molecules in oriented media. We present a probe design for this type of experiment using a contactless resonator. In this circuit, RF power is transmitted wirelessly via coaxial capacitive coupling where the coupling efficiency is improved by replacing the ordinary sample coil with a double frequency resonator. Our probe constructed out of this design principle has shown favorable properties at variable angle conditions. Moreover, a switched angle spinning correlation experiment is performed to demonstrate the probe's capability to resolve dipolar couplings in strongly aligned molecules.
Qian
Chunqi
C
Materials Science Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720, USA.
Pines
Alex
A
Martin
Rachel W
RW
D000465:Algorithms; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation* / Q000379:methods; D008958:Models, Molecular