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Article Dans Une Revue ChemPhysChem Année : 2015

Spin Noise Detection of Nuclear Hyperpolarization at 1.2 K.

Résumé

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.

Domaines

Chimie organique

Dates et versions

hal-01260208 , version 1 (21-01-2016)

Identifiants

Citer

Maria Theresia Pöschko, Basile Vuichoud, Jonas Milani, Aurélien Bornet, Matthias Bechmann, et al.. Spin Noise Detection of Nuclear Hyperpolarization at 1.2 K.. ChemPhysChem, 2015, 16 (18), pp.3859-64. ⟨10.1002/cphc.201500805⟩. ⟨hal-01260208⟩
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