Electron-driven spin diffusion supports crossing the diffusion barrier in MAS DNP

2018 ◽  
Vol 20 (16) ◽  
pp. 11418-11429 ◽  
Author(s):  
Johannes J. Wittmann ◽  
Michael Eckardt ◽  
Wolfgang Harneit ◽  
Björn Corzilius
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Diffusion Barrier ◽  
Nuclear Polarization ◽  
Spin Diffusion ◽  
Hyperfine Interactions ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Diffusion Rates ◽  
Angle Spinning

Hyperfine interactions can quench homonuclear spin-diffusion in the direct vicinity of a polarizing agent in dynamic nuclear polarization (DNP). However, under magic-angle spinning (MAS), the same interactions may also enhance the spin-diffusion rates through an electron-driven spin diffusion (EDSD) mechanism introduced here.

scholarly journals Direct observation of hyperpolarization breaking through the spin diffusion barrier

2021 ◽  
Vol 7 (18) ◽  
pp. eabf5735
Author(s):  
Quentin Stern ◽  
Samuel François Cousin ◽  
Frédéric Mentink-Vigier ◽  
Arthur César Pinon ◽  
Stuart James Elliott ◽  
...  
Keyword(s):  
Diffusion Barrier ◽  
Nuclear Polarization ◽  
Spin Diffusion ◽  
Magic Angle Spinning ◽  
Resonance Spectroscopy ◽  
Magic Angle ◽  
Paramagnetic Centers ◽  
Static Mode ◽  
Angle Spinning ◽  
Marked Dependence

Dynamic nuclear polarization (DNP) is a widely used tool for overcoming the low intrinsic sensitivity of nuclear magnetic resonance spectroscopy and imaging. Its practical applicability is typically bounded, however, by the so-called “spin diffusion barrier,” which relates to the poor efficiency of polarization transfer from highly polarized nuclei close to paramagnetic centers to bulk nuclei. A quantitative assessment of this barrier has been hindered so far by the lack of general methods for studying nuclear polarization flow in the vicinity of paramagnetic centers. Here, we fill this gap and introduce a general set of experiments based on microwave gating that are readily implemented. We demonstrate the versatility of our approach in experiments conducted between 1.2 and 4.2 K in static mode and at 100 K under magic angle spinning (MAS)—conditions typical for dissolution DNP and MAS-DNP—and directly observe the marked dependence of polarization flow on temperature.

scholarly journals Instrumentation for cryogenic magic angle spinning dynamic nuclear polarization using 90 L of liquid nitrogen per day

2017 ◽  
Vol 283 ◽  
pp. 71-78 ◽  
Author(s):  
Brice J. Albert ◽  
Seong Ho Pahng ◽  
Nicholas Alaniva ◽  
Erika L. Sesti ◽  
Peter W. Rand ◽  
...  
Keyword(s):  
Liquid Nitrogen ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Angle Spinning

Silica materials with wall-embedded nitroxides provide efficient polarization matrices for dynamic nuclear polarization NMR

2016 ◽  
Vol 52 (32) ◽  
pp. 5531-5533 ◽  
Author(s):  
Eric Besson ◽  
Fabio Ziarelli ◽  
Emily Bloch ◽  
Guillaume Gerbaud ◽  
Séverine Queyroy ◽  
...  
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Solid State Nmr ◽  
High Field ◽  
Nuclear Polarization ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Hybrid Silica ◽  
Silica Materials ◽  
Field Dynamic ◽  
Angle Spinning

Hybrid silica materials with wall-embedded nitroxides efficiently polarize impregnated substrates in high-field dynamic nuclear polarization magic-angle spinning solid-state NMR experiments.

Correction to “Directly vs Indirectly Enhanced 13C in Dynamic Nuclear Polarization Magic Angle Spinning NMR Experiments of Nonionic Surfactant Systems”

2017 ◽  
Vol 121 (42) ◽  
pp. 23847-23847
Author(s):  
Markus M. Hoffmann ◽  
Sarah Bothe ◽  
Torsten Gutmann ◽  
Frank-Frederik Hartmann ◽  
Michael Reggelin ◽  
...  
Keyword(s):  
Nonionic Surfactant ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Surfactant Systems ◽  
Angle Spinning

scholarly journals 19F Dynamic Nuclear Polarization at Fast Magic Angle Spinning for NMR of HIV-1 Capsid Protein Assemblies

2019 ◽  
Vol 141 (14) ◽  
pp. 5681-5691 ◽  
Author(s):  
Manman Lu ◽  
Mingzhang Wang ◽  
Ivan V. Sergeyev ◽  
Caitlin M. Quinn ◽  
Jochem Struppe ◽  
...  
Keyword(s):  
Capsid Protein ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Protein Assemblies ◽  
Angle Spinning ◽  
Fast Magic Angle Spinning ◽  
Hiv 1

scholarly journals Cryogenic sample exchange NMR probe for magic angle spinning dynamic nuclear polarization

2009 ◽  
Vol 198 (2) ◽  
pp. 261-270 ◽  
Author(s):  
Alexander B. Barnes ◽  
Melody L. Mak-Jurkauskas ◽  
Yoh Matsuki ◽  
Vikram S. Bajaj ◽  
Patrick C.A. van der Wel ◽  
...  
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Angle Spinning

Theoretical aspects of Magic Angle Spinning - Dynamic Nuclear Polarization

2015 ◽  
Vol 258 ◽  
pp. 102-120 ◽  
Author(s):  
Frederic Mentink-Vigier ◽  
Ümit Akbey ◽  
Hartmut Oschkinat ◽  
Shimon Vega ◽  
Akiva Feintuch
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Angle Spinning
Sign in / Sign up

Export Citation Format

Share Document