By Stefan Glöggler, Bernhard Blümich, Stephan Appelt (auth.), Henrike Heise, Stephen Matthews (eds.)

NMR Spectroscopy for Chemical research at Low Magnetic Fields, via Stefan Glöggler, Bernhard Blümich, Stephan Appelt

Dynamic Nuclear Hyperpolarization in beverages, through Ulrich L. Günther

NMR with a number of Receivers, by way of Eriks Kupce

TROSY NMR Spectroscopy of huge Soluble Proteins, by way of Yingqi Xu, Stephen Matthews

Solid-State NMR Spectroscopy of Proteins, by way of Henrik Müller, Manuel Etzkorn, Henrike Heise

Paramagnetic Solid-State Magic-Angle Spinning NMR Spectroscopy, by way of Guido Pintacuda, Gwendal Kervern

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L. G€ unther These concepts will be presented in Sect. 2. 3 K, which are, after rapid dissolution, transported into a higher field magnet (D-DNP). This version of DNP achieves by far the largest enhancements by combining a Boltzmann and a DNP enhancement, although the irreversibility of the dissolution process limits applications to one brief NMR experiment to be carried out during the T1 relaxation time of the involved nuclei. Despite this limitation, D-DNP has become a highly popular implementation of DNP, driven by enormous enhancements of >10,000 and considerable successes in MRI applications.

The last term represents the flip-flop terms causing polarization transfer. Here, SÆ ¼ Sx0 Æ iSy0 and IÆ ¼ Ix0 Æ iIy0 are the step operators, and AzÆ ¼ Azx Æ iAzx represents the tensor elements of the hyperfine coupling. The detailed transformation can be found in [61, 62]. Wenckebach developed this approach to describe coherent polarization transfer in the rotating frame; this is required for the nuclear orientation via electron spin locking (NOVEL) pulsed DNP experiment [64] in which a spin lock is applied to the electrons.

3 Experimental Implementations and Applications . . . . . . . . . . . . . . . . . . . . . . 1 SS-DNP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 O-DNP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Dissolution and Temperature Jump DNP . . . . . . . . . . . . . . . . . . . . . . . 4 Polarizing Agents .

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