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Spin Noise Detection of Nuclear Hyperpolarization at 1.2 K.

  • Pöschko MT Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstraße 69, 4040, Linz, Austria.
  • Vuichoud B Institut de Sciences et Ingénerie Chimiques, Ecole Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland.
  • Milani J Institut de Sciences et Ingénerie Chimiques, Ecole Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland.
  • Bornet A Institut de Sciences et Ingénerie Chimiques, Ecole Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland.
  • Bechmann M Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstraße 69, 4040, Linz, Austria.
  • Bodenhausen G Institut de Sciences et Ingénerie Chimiques, Ecole Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland.
  • Jannin S Institut de Sciences et Ingénerie Chimiques, Ecole Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland. sami.jannin@epfl.ch.
  • Müller N Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstraße 69, 4040, Linz, Austria. norbert.mueller@jku.at.
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  • 2015-10-20
Published in:
  • Chemphyschem : a European journal of chemical physics and physical chemistry. - 2015
dynamic nuclear polarization
non-linear effects
nuclear magnetic resonance
radiation damping
spin noise
English We report proton spin noise spectra of a hyperpolarized solid sample of commonly used "DNP (dynamic nuclear polarization) juice" containing TEMPOL (4-hydroxy-2,2,6,6-tetramethylpiperidine N-oxide) and irradiated by a microwave field at a temperature of 1.2 K in a magnetic field of 6.7 T. The line shapes of the spin noise power spectra are sensitive to the variation of the microwave irradiation frequency and change from dip to bump, when the electron Larmor frequency is crossed, which is shown to be in good accordance with theory by simulations. Small but significant deviations from these predictions are observed, which can be related to spin noise and radiation damping phenomena that have been reported in thermally polarized systems. The non-linear dependence of the spin noise integral on nuclear polarization provides a means to monitor hyperpolarization semi-quantitatively without any perturbation of the spin system by radio frequency irradiation.
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  • English
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hybrid
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https://sonar.ch/global/documents/282289
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