EPR Study of H and D Atoms in Quench-Condensed Solid D $$_{2}$$ 2

Dmitriev, Yu. A.

doi:10.1007/s10909-015-1310-1

Cited by 6 publications

(6 citation statements)

References 40 publications

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“…The electron spin-lattice relaxation times were measured previously in several experiments. It turned out that the relaxation times measured at 0.3 T [14,15,16], 0.86 T [17], 4.6 T [18] and the present work agree with each other within 1-2 orders of magnitude. Based on the assumption that the electron-spin relaxation at helium temperatures and below proceeds via the direct process, a strong, 1…”

Section: Resultssupporting

confidence: 85%

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

et al. 2016

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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 H 2 , D 2 , and HD mixtures. The electron and nuclear spin relaxation times (T 1e and T 1N ) 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 1e is nearly temperature independent in this temperature range, while T 1N decreased by 2 orders of magnitude. 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 D 2 and D 2 :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 behaviour 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 center of the ESR spectrum. This phenomenon can be explained in terms of clusters or pairs of H atoms with 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.

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Section: Resultssupporting

confidence: 85%

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

et al. 2016

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“…A similar component with a width of about 0.3 G was reported previously [5]. The observed linewidth for C3 is smaller than those reported in all previous studies of H atoms in solid H 2 lms at temperatures below 1 K and comparable to those, 0.1 G, observed at T ≥ 4.2K by Kumada et al [19] and Iskovskikh et al [20] for H atoms in solid H 2 and Dmitriev [21] for D atoms in solid D 2 . The observed T 1N time for this component was nearly two orders of magnitude shorter than those of C1 and C2.…”

Section: Discussionsupporting

confidence: 87%

Studies of nuclear polarization of hydrogen atoms embedded in solid molecular hydrogen and hydrogen deuteride films

Sheludiakov

Lee

Khmelenko

et al. 2020

Low Temperature Physics

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We report on an electron-spin resonance study of nuclear polarization of hydrogen atoms embedded in solid H2 and HD lms at temperatures 0.1-1.5 K and in a high magnetic eld of 4.6 T. Similar to our previous work [Sheludiakov et al. Phys. Rev. Lett. 122, 225301 (2019)], we observed a build-up of the spontaneously (p 0.35) and highly nuclear polarized phases (p 0.75) of H atoms in the as-deposited H2 lms. However, we did not obtain enhanced nuclear polarization of H atoms in the regions of their small local concentration. We also failed to observe enhanced nuclear polarization for H atoms in the annealed H2 lms as well as in the as-deposited HD sample. These observations tend to support our previous explanation for the buildup of high nuclear polarization due to the formation of weakly-bound triplet H2 molecules.I.

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“…Several techniques were used previously for studies of ions and electrons in cryocrystals of hydrogen and its isotopes and rare-gas matrices, including infrared spectroscopy [21], ESR [18,[22][23][24] registration of electron emission current [7] and detection of the cyclotron resonance of emitted electrons [4,25]. Ionization of matrix atoms or molecules was done by irradiation with UV, γ or x rays.…”

Section: Discussionmentioning

confidence: 99%

Electrons Trapped in Solid Neon–Hydrogen Mixtures Below $$1\, \hbox {K}$$

et al. 2018

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We report on an electron spin resonance study of electrons stabilized in solid films of neon-hydrogen mixtures. We found that these films are highly porous and may absorb large amount of liquid helium. We observed that free electrons can be stabilized in two different positions: in a pure neon environment and in H 2 clusters formed in the pores of solid neon. It turned out that the presence of the superfluid helium film suppresses the escape of the trapped electrons via diffusion through the pores and stimulates their accumulation in the H 2 clusters even in Ne samples of the best available purity. We propose several possible explanations for this behavior.

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EPR Study of H and D Atoms in Quench-Condensed Solid D $$_{2}$$ 2

Cited by 6 publications

References 40 publications

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

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

Studies of nuclear polarization of hydrogen atoms embedded in solid molecular hydrogen and hydrogen deuteride films

Electrons Trapped in Solid Neon–Hydrogen Mixtures Below $$1\, \hbox {K}$$

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