The phenomenology of optically pumped 13C NMR in diamond at 7.05 T: Room temperature polarization, orientation dependence, and the effect of defect concentration on polarization dynamics
The phenomenology of optically pumped 13C NMR in diamond at 7.05 T: Room temperature polarization, orientation dependence, and the effect of defect concentration on polarization dynamics
Scott, E., M. Drake, and J.A. Reimer, The phenomenology of optically pumped 13C NMR in diamond at 7.05 T: Room temperature polarization, orientation dependence, and the effect of defect concentration on polarization dynamics. J. Magn. Reson., 2016. 264: p. 154-162.
Room temperature optical illumination of NV- imbibed single crystal diamonds with a 532 nm laser produces 13C polarization enhancements up to 200 times greater than that of the thermal equilibrium value at 7.05 T. We report high field NV- mediated 13C polarization as a function of the number and type (NV- and P1) of defects in commercially available diamonds. Surprisingly, both positive and negative 13C polarizations are observed depending on the orientation of the crystal with respect to the external magnetic field and the electric field vector of the optical illumination. The data reported herein cannot be explained by a previously proposed mechanism.
Solid effect DNP polarization dynamics in a system of many spins
From The DNP-NMR Blog:
Solid effect DNP polarization dynamics in a system of many spins
Wisniewski, D., et al., Solid effect DNP polarization dynamics in a system of many spins. J Magn Reson, 2016. 264: p. 30-8.
http://www.ncbi.nlm.nih.gov/pubmed/26920828
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04-06-2016 10:29 PM
Solid-State Dynamic Nuclear Polarization at 9.4 and 18.8 T from 100 K to Room Temperature
From The DNP-NMR Blog:
Solid-State Dynamic Nuclear Polarization at 9.4 and 18.8 T from 100 K to Room Temperature
This is an incredible article. It shows the temperature dependence of the DNP enhancement over a wide temperature regime. Most importantly it shows that at room temperature still an enhancement of 15-20 can be achieved.
Just a few years ago the common believe was that solid-state MAS-DNP experiments have to be performed at 90 K or below. This article clearly demonstrates that there is still so much room for improvements of DNP. I think the most exciting moments in DNP are...
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03-04-2016 10:23 PM
Solid-State Dynamic Nuclear Polarization at 9.4 and 18.8 T from 100 K to Room Temperature
From The DNP-NMR Blog:
Solid-State Dynamic Nuclear Polarization at 9.4 and 18.8 T from 100 K to Room Temperature
Lelli, M., et al., Solid-State Dynamic Nuclear Polarization at 9.4 and 18.8 T from 100 K to Room Temperature. J Am Chem Soc, 2015. 137(46): p. 14558-61.
http://www.ncbi.nlm.nih.gov/pubmed/26555676
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12-07-2015 06:38 PM
The magnetic field dependence of cross-effect dynamic nuclear polarization under magic angle spinning
From The DNP-NMR Blog:
The magnetic field dependence of cross-effect dynamic nuclear polarization under magic angle spinning
Mance, D., et al., The magnetic field dependence of cross-effect dynamic nuclear polarization under magic angle spinning. J. Chem. Phys., 2015. 142(23): p. 234201.
doi:http://dx.doi.org/10.1063/1.4922219
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07-06-2015 04:35 PM
Proton polarization in photo-excited aromatic molecule at room temperature enhanced by intense optical source and temperature control
From The DNP-NMR Blog:
Proton polarization in photo-excited aromatic molecule at room temperature enhanced by intense optical source and temperature control
Sakaguchi, S., et al., Proton polarization in photo-excited aromatic molecule at room temperature enhanced by intense optical source and temperature control. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2013. 317(0): p. 679-684.
http://www.sciencedirect.com/science/article/pii/S0168583X13008872
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01-23-2014 01:37 AM
Quantitative cw Overhauser effect dynamic nuclear polarization for the analysis of local water dynamics
From The DNP-NMR Blog:
Quantitative cw Overhauser effect dynamic nuclear polarization for the analysis of local water dynamics
Franck, J.M., et al., Quantitative cw Overhauser effect dynamic nuclear polarization for the analysis of local water dynamics. Prog Nucl Magn Reson Spectrosc, 2013. 74(0): p. 33-56.
http://www.ncbi.nlm.nih.gov/pubmed/24083461
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11-21-2013 01:14 AM
Proton polarization in photo-excited aromatic molecule at room temperature enhanced by intense optical source and temperature control
From The DNP-NMR Blog:
Proton polarization in photo-excited aromatic molecule at room temperature enhanced by intense optical source and temperature control
Sakaguchi, S., et al., Proton polarization in photo-excited aromatic molecule at room temperature enhanced by intense optical source and temperature control. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2013(0).
http://www.sciencedirect.com/science/article/pii/S0168583X13008872
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11-21-2013 01:14 AM
Temperature dependence of high field 13C dynamic nuclear polarization processes with trityl radicals below 35 Kelvin
From The DNP-NMR Blog:
Temperature dependence of high field 13C dynamic nuclear polarization processes with trityl radicals below 35 Kelvin
Walker, S.A., et al., Temperature dependence of high field 13C dynamic nuclear polarization processes with trityl radicals below 35 Kelvin. Phys. Chem. Chem. Phys., 2013.
http://dx.doi.org/10.1039/C3CP51628H
The phenomenology of optically pumped 13C NMR in diamond at 7.05 T: Room temperature polarization, orientation dependence, and the effect of defect concentration on polarization dynamics
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