ammonia then transfers it other molecules that don't bind as well to the metal catalyst. This enhanced NMR signal allows the rapid analysis of very small amounts of material. See also Dynamic nuclear polarization Electron paramagnetic resonance Hyperpolarized carbon-13 MRI References External links Europhysics - "Take a breath of polarized noble gas" University of Virginia - "Hyperpolarized Gas MR Imaging" Swiss DNP Initiative - "DNP-NMR 13C Hyperpolarization" Nuclear physics Magnetic resonance imaging Nuclear magnetic resonance