Journal
CHEMICAL PHYSICS LETTERS
Volume 602, Issue -, Pages 63-67Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2014.04.013
Keywords
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Funding
- Swiss National Science Foundation
- Ecole Polytechnique Federale de Lausanne ( EPFL)
- Swiss Commission for Technology and Innovation ( CTI),
- CNRS
- European Research Council ( ERC)
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Hyperpolarization by Dissolution Dynamic Nuclear Polarization is usually achieved by monochromatic microwave irradiation of the ESR spectrum of free radicals embedded in glasses at 1.2 K and 3.35 T. Hovav et al. (2014) have recently shown that by using frequency-modulated (rather than monochromatic) microwave irradiation one can improve DNP at 3.35 T in the temperature range 10-50 K. We show in this Letter that this is also true under Dissolution-DNP conditions at 1.2 K and 6.7 T. We demonstrate the many virtues of using frequency-modulated microwave irradiation: higher polarizations, faster buildup rates, lower radical concentrations, less paramagnetic broadening, more efficient cross-polarization, and less critical frequency adjustments. (C) 2014 The Authors. Published by Elsevier B.V.
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