Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 7, Issue 1, Pages 111-116Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.5b02720
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Funding
- National Institutes of Biomedical Imaging and Bioengineering [EB-002026, EB-002804]
- Rubicon Fellowship from The Netherlands Organization for Scientific Research (NWO)
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Continuous-wave (CW) dynamic nuclear polarization (DNP) is now established as a method of choice to enhance the sensitivity in a variety of NMR experiments. Nevertheless, there remains a need for the development of more efficient methods to transfer polarization from electrons to nuclei. Of particular interest are pulsed DNP methods because they enable a rapid and efficient polarization transfer that, in contrast with CW DNP methods, is not attenuated at high magnetic fields. Here we report nuclear spin orientation via electron spin-locking (NOVEL) experiments using the polarizing agent trityl OX063 in glycerol/water at a temperature of 80 K and a magnetic field of 0.34 T. H-1 NMR signal enhancements up to 430 are observed, and the buildup of the local polarization occurs in a few hundred nanoseconds. Thus, NOVEL can efficiently dynamically polarize H-1 atoms in a system that is of general interest to the solid-state DNP NMR community. This is a first, important step toward the general application of pulsed DNP at higher fields.
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