Compression of spin-polarized hydrogen bubbles to thermal explosion

Tommila, T.; Tjukanov, E.; Krusius, M.; Jaakkola, S.

doi:10.1103/physrevb.36.6837

Cited by 17 publications

(6 citation statements)

References 34 publications

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“…Studies in the water-poor region are rare and so far have not provided a de-tailed structural and dynamical picture, as given herein. Additionally, the experimental techniques that were used, such as measurements of thermodynamic quantities, [10][11][12][13][14] measurements of excitation spectra via infrared absorption, [15,16] Raman scattering [15] or NMR as well as inelastic neutron scattering or X-ray scattering [9,[24][25][26][27] in isolation are either not sensitive to the detailed microscopic structure or require a considerable degree of interpretation to obtain structural information. Additional methods or a reliable combination of methods are needed to obtain a direct insight into the structure of water-DMSO aggregates.…”

Section: Introductionmentioning

confidence: 99%

Structure and Dynamics of Water Confined in Dimethyl Sulfoxide

Wulf

Ludwig

2006

ChemPhysChem

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We study the structure and dynamics of hydrogen-bonded complexes of H2O/D2O and dimethyl sulfoxide (DMSO) by infrared spectroscopy, NMR spectroscopy and ab initio calculations. We find that single water molecules occur in two configurations. For one half of the water monomers both OH/OD groups form strong hydrogen bonds to DMSO molecules, whereas for the other half only one of the two OH/OD groups is hydrogen-bonded to a solvent molecule. The H-bond strength between water and DMSO is in the order of that in bulk water. NMR deuteron relaxation rates and calculated deuteron quadrupole coupling constants yield rotational correlation times of water. The molecular reorientation of water monomers in DMSO is two-and-a-half times slower than in bulk water. This result can be explained by local structure behavior.

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Section: Introductionmentioning

confidence: 99%

Structure and Dynamics of Water Confined in Dimethyl Sulfoxide

Wulf

Ludwig

2006

ChemPhysChem

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“…The sample length decreases from 3 mm to the value determined by the He level difference in the final stage of the compression. For a sufficiently strong compression at the end of the decay, the sample evolves into a bubble, which rapidly collapses due to the surface tension pressure of He [15]. The bubble stage is easily identified by a change in the ESR line shape.…”

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confidence: 98%

“…Compression to densities %10 18 cm À3 is sensitive to the compression rate, cell temperature, and nuclear polarization. Thermal explosions [15] could be easily triggered by a too fast compression. By measuring the change of the hydrostatic head during the decays, we were able to perform an absolute density calibration of the ESR absorption integrals.…”

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confidence: 99%

Clock Shift in High Field Magnetic Resonance of Atomic Hydrogen

et al. 2008

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We have measured electron spin resonance line shifts due to collisions in atomic hydrogen gas compressed to densities approximately 10(18) cm(-3) in a strong magnetic field (4.6 T). The shift in a doubly polarized gas is negligible, in contrast with a mixture of two hyperfine states. This difference is explained by properly including effects of quantum statistics in atomic collisions and magnetic dipolar effects. We report on the first direct measurement of the difference between the triplet and singlet s-wave scattering lengths a(t) - a(s) = 60(10) pm, which is in agreement with existing theories.

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“…In order to evaluate the properties of the gas sample during further evolution we use numerical simulation of the bubble decay which is fitted to the ESR and level meter data in the beginning part of the decay. The simulation is based on the approach used in similar work with H gas bubbles at high density [38]. We solve a set of the coupled kinetic equations for each of the four hyperfine states which account for different recombination and relaxation mechanisms.…”

Section: Bubblesmentioning

confidence: 99%

Identical spin rotation effect and electron spin waves in quantum gas of atomic hydrogen

et al. 2018

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Spin waves in quantum gases-the quality factor of the identical spin rotation effect L Lehtonen, O Vainio, J Ahokas et al. AbstractWe present an experimental study of electron spin waves in atomic hydrogen gas compressed to high densities of ∼5×10 18 cm −3 at temperatures ranging from 0.26 to 0.6 K in the strong magnetic field of 4.6 T. Hydrogen gas is in a quantum regime when the thermal de-Broglie wavelength is much larger than the s-wave scattering length. In this regime the identical particle effects play a major role in atomic collisions and lead to the identical spin rotation effect (ISR). We observed a variety of spin wave modes caused by this effect with strong dependence on the magnetic potential caused by variations of the polarizing magnetic field. We demonstrate confinement of the ISR modes in the magnetic potential and manipulate their properties by changing the spatial profile of the magnetic field. We have found that at a high enough density of H gas the magnons accumulate in their ground state in the magnetic trap and exhibit long coherence, which has a profound effect on the electron spin resonance spectra. Such macroscopic accumulation of the ground state occurs at a certain critical density of hydrogen gas, where the chemical potential of the magnons becomes equal to the energy of their ground state in the trapping potential.

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Compression of spin-polarized hydrogen bubbles to thermal explosion

Cited by 17 publications

References 34 publications

Structure and Dynamics of Water Confined in Dimethyl Sulfoxide

Structure and Dynamics of Water Confined in Dimethyl Sulfoxide

Clock Shift in High Field Magnetic Resonance of Atomic Hydrogen

Identical spin rotation effect and electron spin waves in quantum gas of atomic hydrogen

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