Observation of strongly forbidden solid effect dynamic nuclear polarization transitions via electron-electron double resonance detected NMR

Smith, Albert A.; Corzilius, Björn; Haze, Olesya; Swager, Timothy M.

doi:10.1063/1.4832323

Title: Observation of strongly forbidden solid effect dynamic nuclear polarization transitions via electron-electron double resonance detected NMR

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Abstract

We present electron paramagnetic resonance experiments for which solid effect dynamic nuclear polarization transitions were observed indirectly via polarization loss on the electron. This use of indirect observation allows characterization of the dynamic nuclear polarization (DNP) process close to the electron. Frequency profiles of the electron-detected solid effect obtained using trityl radical showed intense saturation of the electron at the usual solid effect condition, which involves a single electron and nucleus. However, higher order solid effect transitions involving two, three, or four nuclei were also observed with surprising intensity, although these transitions did not lead to bulk nuclear polarization—suggesting that higher order transitions are important primarily in the transfer of polarization to nuclei nearby the electron. Similar results were obtained for the SA-BDPA radical where strong electron-nuclear couplings produced splittings in the spectrum of the indirectly observed solid effect conditions. Observation of high order solid effect transitions supports recent studies of the solid effect, and suggests that a multi-spin solid effect mechanism may play a major role in polarization transfer via DNP.

Authors:: Smith, Albert A.; Corzilius, Björn; Haze, Olesya; Swager, Timothy M.

Publication Date:: Sat Dec 07 00:00:00 EST 2013

OSTI Identifier:: 22251287

Resource Type:: Journal Article

Journal Name:: Journal of Chemical Physics

Additional Journal Information:: Journal Volume: 139; Journal Issue: 21; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-9606

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; COUPLINGS; EFFICIENCY; ELDOR; ELECTRON SPIN RESONANCE; ELECTRONS; NUCLEAR MAGNETIC RESONANCE; POLARIZATION; RADICALS; SOLIDS; SPECTRA; SPIN

Citation Formats


                    Smith, Albert A., Corzilius, Björn, Haze, Olesya, Swager, Timothy M., and Griffin, Robert G., E-mail: rgg@mit.edu. Observation of strongly forbidden solid effect dynamic nuclear polarization transitions via electron-electron double resonance detected NMR.  United States: N. p., 2013. 
        Web.  doi:10.1063/1.4832323.

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                    Smith, Albert A., Corzilius, Björn, Haze, Olesya, Swager, Timothy M., & Griffin, Robert G., E-mail: rgg@mit.edu. Observation of strongly forbidden solid effect dynamic nuclear polarization transitions via electron-electron double resonance detected NMR.  United States.  https://doi.org/10.1063/1.4832323

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                    Smith, Albert A., Corzilius, Björn, Haze, Olesya, Swager, Timothy M., and Griffin, Robert G., E-mail: rgg@mit.edu. 2013.  
        "Observation of strongly forbidden solid effect dynamic nuclear polarization transitions via electron-electron double resonance detected NMR".  United States.  https://doi.org/10.1063/1.4832323.

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@article{osti_22251287,

  title        = {Observation of strongly forbidden solid effect dynamic nuclear polarization transitions via electron-electron double resonance detected NMR},

  author       = {Smith, Albert A. and Corzilius, Björn and Haze, Olesya and Swager, Timothy M. and Griffin, Robert G., E-mail: rgg@mit.edu},

  abstractNote = {We present electron paramagnetic resonance experiments for which solid effect dynamic nuclear polarization transitions were observed indirectly via polarization loss on the electron. This use of indirect observation allows characterization of the dynamic nuclear polarization (DNP) process close to the electron. Frequency profiles of the electron-detected solid effect obtained using trityl radical showed intense saturation of the electron at the usual solid effect condition, which involves a single electron and nucleus. However, higher order solid effect transitions involving two, three, or four nuclei were also observed with surprising intensity, although these transitions did not lead to bulk nuclear polarization—suggesting that higher order transitions are important primarily in the transfer of polarization to nuclei nearby the electron. Similar results were obtained for the SA-BDPA radical where strong electron-nuclear couplings produced splittings in the spectrum of the indirectly observed solid effect conditions. Observation of high order solid effect transitions supports recent studies of the solid effect, and suggests that a multi-spin solid effect mechanism may play a major role in polarization transfer via DNP.},

  doi          = {10.1063/1.4832323},

  url          = {https://www.osti.gov/biblio/22251287},
  journal      = {Journal of Chemical Physics},

  issn         = {0021-9606},

  number       = 21,

  volume       = 139,

  place        = {United States},

  year         = {Sat Dec 07 00:00:00 EST 2013},

  month        = {Sat Dec 07 00:00:00 EST 2013}

}

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