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Default Dipolar Induced Para-Hydrogen-Induced Polarization

From The DNP-NMR Blog:

Dipolar Induced Para-Hydrogen-Induced Polarization


Buntkowsky, G., et al., Dipolar Induced Para-Hydrogen-Induced Polarization. Solid State Nuclear Magnetic Resonance, 2014(0).


http://www.sciencedirect.com/science...26204014000502


Analytical expressions for the signal enhancement in solid-state PHIP NMR spectroscopy mediated by homonuclear dipolar interactions and single pulse or spin-echo excitation are developed and simulated numerically. It is shown that an efficient enhancement of the proton NMR signal in solid-state NMR studies of chemisorbed hydrogen on surfaces is possible. Employing typical reaction efficacy, enhancement-factors of ca. 30–40 can be expected both under ALTADENA and under PASADENA conditions. This result has important consequences for the practical application of the method, since it potentially allows the design of an in-situ flow setup, where the para-hydrogen is adsorbed and desorbed from catalyst surfaces inside the NMR magnet.


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