A large volume flat coil probe for oriented membrane proteins

Enhancing MQMAS of low-γ nuclei by using a high B1 field balanced probe circuit

“…Electrical balancing of the sample rf coil has been used to reduce unwanted eddy currents caused by shields in MRI coils [6], to mitigate B 1 field distortions from wavelength effects in high-frequency spectroscopy applications [5,[7][8][9] and to extend the power handling ability of solid state NMR probes [4,5,7,9]. Fig.…”

Resonator with reduced sample heating and increased homogeneity for solid-state NMR

“…Some alternative ''single-coil'' [12][13][14]17] or ''cross-coil'' [15,16,18,19] geometries have been proposed that exhibit reduced rf electric fields inside the sample volume. Here single-coil geometry means that the coil exhibits, as for a straightforward solenoidal coil, just two coil ports and that it is compatible with the probe rf circuitry used for solenoidal coils.…”

An efficient 1H/31P double-resonance solid-state NMR probe that utilizes a scroll coil

“…The scroll coil is incorporated into the circuit diagrammed in Figure 2, which is an updated version of the original Cross et al (15) circuit and is similar to those used in other applications (16)(17)(18)(19)(20)(21) The circuit is double-tuned to 500 MHz ( 1 H) and 202 MHz ( 31 P). Two variable capacitors (Polyflon NRP/VC10-12-06A, www.polyflon.com) are used in both the 1 H and 31 P tuning networks, indicated as C2 and C3 for the 1 H channel and C6 and C7 for the 31 P channel.…”