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. Author manuscript; available in PMC: 2010 Oct 19.
Published in final edited form as: J Magn Reson. 2009 Jun. doi: 10.1016/j.jmr.2009.03.003

Fig. 3.

Fig. 3

CAD drawings of the probe instrumentation needed for cryogenic MAS. a) Evacuated bearing and drive transfer lines in the probe deliver the cryogens to the probe, while an exhaust transfer line brings the cold cryogens out of the probe without cooling the box containing the tuning elements. 50 W heaters at the termination of the flexible evacuated transfer lines allow for precise control of the temperature. The probe-box is purged with a low pressure flow of room temperature nitrogen gas to prevent condensation. b) Cut-out of probe. Multiple optical channels are required for in situ optical irradiation of the sample, temperature sensing, and monitoring of the MAS frequency. Modifications to the dewar, an angled eject pipe that mates to a commercially available Revolution NMR stator, a GORE-TEX seal, and other modifications are needed for the cryogenic sample exchange system.