Publication

High field dynamic nuclear polarization at 6.7T: Carbon-13 polarization above 70% within 20min

Geoffrey Bodenhausen
2012
Journal Articles

Abstract

In most applications of dissolution-DNP, the polarization of nuclei with low gyromagnetic ratios such as C-13 is enhanced directly by irradiating the ESR transitions of radicals with narrow ESR lines such as Trityl at low temperatures T = 1.2 K in polarizing fields B-0 C-13) in excess of 70% within 20 min. After rapid dissolution to room temperature, this is 122000 times larger than the Boltzmann polarization at 300 K and 6.7 T. (c) 2012 Elsevier B.V. All rights reserved.

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https://infoscience.epfl.ch/entities/publication/0b0ed9cc-a422-4938-a2f6-925cb7bac02e

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Geoffrey Bodenhausen
2012
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/0b0ed9cc-a422-4938-a2f6-925cb7bac02e

About this result

Related concepts (29)

Nuclear magnetic resonance

Nuclear magnetic resonance (NMR) is a physical phenomenon in which nuclei in a strong constant magnetic field are perturbed by a weak oscillating magnetic field (in the near field) and respond by producing an electromagnetic signal with a frequency characteristic of the magnetic field at the nucleus. This process occurs near resonance, when the oscillation frequency matches the intrinsic frequency of the nuclei, which depends on the strength of the static magnetic field, the chemical environment, and the magnetic properties of the isotope involved; in practical applications with static magnetic fields up to ca.

Nuclear Overhauser effect

The nuclear Overhauser effect (NOE) is the transfer of nuclear spin polarization from one population of spin-active nuclei (e.g. 1H, 13C, 15N etc.) to another via cross-relaxation. A phenomenological definition of the NOE in nuclear magnetic resonance spectroscopy (NMR) is the change in the integrated intensity (positive or negative) of one NMR resonance that occurs when another is saturated by irradiation with an RF field. The change in resonance intensity of a nucleus is a consequence of the nucleus being close in space to those directly affected by the RF perturbation.

Temperature

Temperature is a physical quantity that expresses quantitatively the perceptions of hotness and coldness. Temperature is measured with a thermometer. Thermometers are calibrated in various temperature scales that historically have relied on various reference points and thermometric substances for definition. The most common scales are the Celsius scale with the unit symbol °C (formerly called centigrade), the Fahrenheit scale (°F), and the Kelvin scale (K), the latter being used predominantly for scientific purposes.

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