NDLI: Dynamic Nuclear Polarization and Relaxation of H and D Atoms in Solid Mixtures of Hydrogen Isotopes

Content Provider	Springer Nature Link
Author	Sheludiakov, S. Ahokas, J. Järvinen, J. Vainio, O. Lehtonen, L. Vasiliev, S. Lee, D. M. Khmelenko, V. V.
Copyright Year	2016
Abstract	We report on a study of dynamic nuclear polarization and electron and nuclear spin relaxation of atomic hydrogen and deuterium in solid molecular matrices of $$\hbox {H}_{2}, \hbox {D}_{2}$$ , and HD mixtures. The electron and nuclear spin relaxation times ( $$T_{1\mathrm{e}}$$ and $$T_{1\mathrm{N}}$$ ) were measured within the temperature range 0.15–2.5 K in a magnetic field of 4.6 T, conditions which ensure a high polarization of electron spins. We found that $$T_{1\mathrm{e}}$$ is nearly temperature independent in this temperature range, while $$T_{1\mathrm{N}}$$ decreased by two orders of magnitude upon raising temperature. Such strong temperature dependence is typical for the nuclear Orbach mechanism of relaxation via the electron spins. We found that the nuclear spins of H atoms in solid $$\hbox {D}_{2}$$ and $$\hbox {D}_{2}{:}\hbox {HD}$$ can be efficiently polarized by the Overhauser effect. Pumping the forbidden transitions of H atoms also leads to DNP, with the efficiency strongly dependent on the concentration of D atoms. This behavior indicates the cross effect mechanism of the DNP and nuclear relaxation, which turns out to be well resolved in the conditions of our experiments. Efficient DNP of H atoms was also observed when pumping the middle D line located in the center of the ESR spectrum. This phenomenon can be explained in terms of clusters or pairs of H atoms with a strong exchange interaction. These clusters have partially allowed transitions in the center of the ESR spectrum, and DNP may be created via the resolved cross effect.
Starting Page	43
Ending Page	53
Page Count	11
File Format	PDF
ISSN	00222291
Journal	Journal of Low Temperature Physics
Volume Number	187
Issue Number	1-2
e-ISSN	15737357
Language	English
Publisher	Springer US
Publisher Date	2016-12-22
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogen Deuterium Electron spin resonance Dynamic nuclear polarization Condensed Matter Physics Characterization and Evaluation of Materials Magnetism, Magnetic Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Materials Science

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