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. Author manuscript; available in PMC: 2013 Jan 1.
Published in final edited form as: J Magn Reson. 2011 Dec 2;214(1):258–262. doi: 10.1016/j.jmr.2011.11.015

Figure 1.

Figure 1

System schematic for production of parahydrogen by pulsed injection of hydrogen gas. Solenoid (svi) operation is under programmable control to tailor enrichment and preparation time. Aliquots are delivered from an adjustable volume v. The cryo-cooler, temperature controller, and compressor operate in a closed loop. Hydrogen makes thermal contact with the first stage of the cryo-cooler via stainless steel tubing and is routed through a diffusion restricted copper chamber that contains a suitable catalyst in thermal equilibrium with the second stage cold head.