Shielded probehead

The hardware required for PEG work, although commercially available, is not usually included in the basic version of spectrometers. It consists of a gradient accessory, a gradient amplifier, a shielded probehead equipped with a z-gradient coil and a pulse shaper (which in itself is an integral part of the gradient accessory). 

As is the case in most gradient-enhanced pulse sequences, GROESY spectra should preferably be obtained with non-spinning samples. In our spectrometer, a Bruker ARX-400 equipped with an inverse broadband probehead incorporating a shielded Z-gradient coil, we have used the following experimental parameters ... 

Figure 8.2.17 Photograph of a two-coil, multi-tuned probehead, with two solenoids arranged vertically. The impedance matching networks are shielded in copper boxes...

Figure 3.63. Gradient recovery after application of a 1 ms square gradient pulse of 0.25 Tm" (50% of maximum output). The sample is chloroform and data were acquired with an actively-shielded 5 mm inverse z-axis gradient probehead.

Potassium-39,40,41 NMR, 14,261-64,275-76,281-82,290 Powder lineshape, 117-118,153-58,161-68,422 also see Solid state spectra Principal elements of the shielding tensor, 117 Probeheads, 8... 

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