The efficiency of continuous wave dynamic nuclear polarization (DNP) experiments decreases at the high magnetic fields used in contemporary high-resolution NMR applications. To recover the expected signal enhancements from DNP, we explored time domain experiments such as NOVEL which matches the electron Rabi frequency to the nuclear Larmor frequency to mediate polarization transfer. However, satisfying this matching condition at high frequencies is technically demanding. As an alternative we report here frequency-swept integrated solid effect (FS-ISE) experiments that allow low power sweeps of the exciting microwave frequencies to constructively integrate the negative and positive polarizations of the solid effect, thereby producing a polarization efficiency comparable to (+/-10 % difference) NOVEL. Finally, the microwave frequency modulation results in field profiles that exhibit new features that we coin the "stretched" solid effect.
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Bis-Gadolinium Complexes for Solid Effect and Cross Effect Dynamic Nuclear Polarization #DNPNMR
From The DNP-NMR Blog:
Bis-Gadolinium Complexes for Solid Effect and Cross Effect Dynamic Nuclear Polarization #DNPNMR
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Kaushik, M., et al., Bis-Gadolinium Complexes for Solid Effect and Cross Effect Dynamic Nuclear Polarization. Angew Chem Int Ed Engl, 2017. 56(15): p. 4295-4299.
https://www.ncbi.nlm.nih.gov/pubmed/28319293
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07-15-2017 05:05 PM
Field-frequency locked X-band Overhauser effect spectrometer #DNPNMR
From The DNP-NMR Blog:
Field-frequency locked X-band Overhauser effect spectrometer #DNPNMR
This article is already a bit older. However, it nicely illustrates that DNP, specifically ODNP has been around for a while already, and gives some interesting specifics on the instrumentation that are still valid today.
Chandrakumar, N. and P.T. Narasimhan, Field-frequency locked X-band Overhauser effect spectrometer. Review of Scientific Instruments, 1981. 52(4): p. 533-538.
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04-11-2017 04:25 AM
Dynamic nuclear polarisation via the integrated solid effect II: experiments on naphthalene-h8doped with pentacene-d14 #DNPNMR
From The DNP-NMR Blog:
Dynamic nuclear polarisation via the integrated solid effect II: experiments on naphthalene-h8doped with pentacene-d14 #DNPNMR
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Eichhorn, T.R., et al., Dynamic nuclear polarisation via the integrated solid effect II: experiments on naphthalene-h8doped with pentacene-d14. Mol. Phys., 2013. 112(13): p. 1773-1782.
https://doi.org/10.1080/00268976.2013.863405
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02-01-2017 04:20 PM
Dynamic nuclear polarisation via the integrated solid effect I: theory #DNPNMR
From The DNP-NMR Blog:
Dynamic nuclear polarisation via the integrated solid effect I: theory #DNPNMR
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Henstra, A. and W.T. Wenckebach, Dynamic nuclear polarisation via the integrated solid effect I: theory. Mol. Phys., 2013. 112(13): p. 1761-1772.
https://doi.org/10.1080/00268976.2013.861936
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01-16-2017 06:09 PM
Correction: Theory of solid effect and cross effect dynamic nuclear polarization with half-integer high-spin metal polarizing agents in rotating solids #DNPNMR
From The DNP-NMR Blog:
Correction: Theory of solid effect and cross effect dynamic nuclear polarization with half-integer high-spin metal polarizing agents in rotating solids #DNPNMR
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Corzilius, B., Correction: Theory of solid effect and cross effect dynamic nuclear polarization with half-integer high-spin metal polarizing agents in rotating solids. Phys. Chem. Chem. Phys., 2016. 18(42): p. 29643-29643.
http://dx.doi.org/10.1039/C6CP90249A
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12-17-2016 07:18 AM
Theory of solid effect and cross effect dynamic nuclear polarization with half-integer high-spin metal polarizing agents in rotating solids #DNPNMR
From The DNP-NMR Blog:
Theory of solid effect and cross effect dynamic nuclear polarization with half-integer high-spin metal polarizing agents in rotating solids #DNPNMR
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Corzilius, B., Theory of solid effect and cross effect dynamic nuclear polarization with half-integer high-spin metal polarizing agents in rotating solids. Phys. Chem. Chem. Phys., 2016. 18(39): p. 27190-27204.
http://dx.doi.org/10.1039/C6CP04621E
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11-21-2016 11:02 PM
Frequency swept microwaves for hyperfine decoupling and time domain dynamic nuclear polarization
From The DNP-NMR Blog:
Frequency swept microwaves for hyperfine decoupling and time domain dynamic nuclear polarization
Hoff, D.E., et al., Frequency swept microwaves for hyperfine decoupling and time domain dynamic nuclear polarization. Solid State Nucl Magn Reson, 2015. 72: p. 79-89.
http://www.ncbi.nlm.nih.gov/pubmed/26482131
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03-23-2016 04:01 PM
Frequency swept microwaves for hyperfine decoupling and time domain dynamic nuclear polarization
From The DNP-NMR Blog:
Frequency swept microwaves for hyperfine decoupling and time domain dynamic nuclear polarization
Hoff, D.E., et al., Frequency swept microwaves for hyperfine decoupling and time domain dynamic nuclear polarization. Solid State Nucl Magn Reson, 2015.
http://www.ncbi.nlm.nih.gov/pubmed/26482131
Frequency-Swept Integrated Solid Effect #DNPNMR
Linear Mode
