[Polarisation dynamique nucléaire]
La polarisation nucléaire dynamique (en anglais DNP) se réfère à l'augmentation de la polarisation de spins nucléaires dans la matière condensée, liquide ou solide, couplés à des spins électroniques à faible concentration relative, en induisant des transitions radio ou micro-ondes de fréquence proche d'une fréquence de résonance électronique dans un champ magnétique extérieur. Une autre méthode décrite consiste en l'utilisation indirecte du pompage optique à température proche de la température ordinaire pour la polarisation nucléaire de gaz rares. Les divers mécanismes de polarisation sont décrits en termes physiques. Ceci est suivi d'une description succincte des principales applications de la DNP dans différents domaines de la physique, de la chimie et de la médecine.
Dynamic nuclear polarization, or DNP, refers to the increase of the polarization of nuclear spins in condensed matter, liquid or solid, coupled with electronic spins at low relative concentration, by inducing radio or microwave transitions at frequencies close to the electronic resonance frequency in the external magnetic field. Another described method relies on indirect optical pumping methods at temperatures close to room temperature for the nuclear polarization of rare gases. The various mechanisms of DNP are described in physical terms. This is followed by a succinct description of its main applications in various domains of physics, in chemistry and in medicine.
Mots-clés : DNP, Liquides, Solides, Gaz, Applications
Maurice Goldman 1
@article{CRPHYS_2019__20_7-8_694_0,
author = {Maurice Goldman},
title = {Dynamic nuclear polarization},
journal = {Comptes Rendus. Physique},
pages = {694--705},
publisher = {Elsevier},
volume = {20},
number = {7-8},
year = {2019},
doi = {10.1016/j.crhy.2019.05.010},
language = {en},
}
Maurice Goldman. Dynamic nuclear polarization. Comptes Rendus. Physique, La science en mouvement 2 : de 1940 aux premières années 1980 – Avancées en physique, Volume 20 (2019) no. 7-8, pp. 694-705. doi : 10.1016/j.crhy.2019.05.010. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2019.05.010/
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