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Spin Noise Detection of Nuclear Hyperpolarization at 1.2 K
Author(s) -
Pöschko Maria Theresia,
Vuichoud Basile,
Milani Jonas,
Bornet Aurélien,
Bechmann Matthias,
Bodenhausen Geoffrey,
Jannin Sami,
Müller Norbert
Publication year - 2015
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201500805
Subject(s) - hyperpolarization (physics) , chemistry , microwave , polarization (electrochemistry) , condensed matter physics , nuclear magnetic resonance , spectral line , spin polarization , proton , irradiation , larmor precession , electron paramagnetic resonance , spin (aerodynamics) , noise (video) , physics , magnetic field , electron , nuclear magnetic resonance spectroscopy , nuclear physics , quantum mechanics , artificial intelligence , computer science , image (mathematics) , thermodynamics
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.