Nuclear magnetic resonance studies of tunneling in quantum solids at very low temperatures

Sullivan, N. S.

doi:10.1016/j.pnmrs.2015.08.001

Progress in Nuclear Magnetic Resonance Spectroscopy

2015

DOI: 10.1016/j.pnmrs.2015.08.001

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Nuclear magnetic resonance studies of tunneling in quantum solids at very low temperatures

N. S. Sullivan

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Hydrogen atom quantum diffusion in solid parahydrogen: The H + N2O → cis-HNNO → trans-HNNO reaction

Mutunga

Olenyik

Strom

et al. 2021

The Journal of Chemical Physics

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The diffusion and reactivity of hydrogen atoms in solid parahydrogen at temperatures between 1.5 K and 4.3 K are investigated by high-resolution infrared spectroscopy. Hydrogen atoms are produced within solid parahydrogen as the by-products of the 193 nm in situ photolysis of N2O, which induces a two-step tunneling reaction, H + N2O → cis-HNNO → trans-HNNO. The second-order rate constant for the first step to form cis-HNNO is found to be inversely proportional to the N2O concentration after photolysis, indicating that the hydrogen atoms move through solid parahydrogen via quantum diffusion. This reaction only readily occurs at temperatures below 2.8 K, not due to an increased rate constant for the first reaction step at low temperatures but rather due to an increased selectivity to the reaction. The rate constant for the second step of the reaction mechanism involving unimolecular isomerization is shown to be independent of the N2O concentration as expected. The inverse concentration dependence of the rate constant for the reaction step that involves the hydrogen atom demonstrates clearly that quantum diffusion influences the reactivity of the hydrogen atoms in solid parahydrogen, which does not have an analogy in classical reaction kinetics.

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Hydrogen atom quantum diffusion in solid parahydrogen: The H + N2O → cis-HNNO → trans-HNNO reaction

Mutunga

Olenyik

Strom

et al. 2021

The Journal of Chemical Physics

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Purely spatial diffusion of H atoms in solid normal- and para-hydrogen films

et al. 2022

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Phase separation in dilute solutions ofHe3in solidHe4

et al. 2017

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We report the results of studies of the phase separation of solid solutions of dilute concentrations of 3 He in 4 He. The temperatures and the kinetics of the phase separation were determined from NMR experiments for 3 He concentrations 1.6 × 10 −5 < x 3 < 2.0 × 10 −3 . The experimentally observed phase separation temperatures are found to be in excellent agreement with regular solution theory as augmented by Edwards and Balibar [Phys.Rev. B39,4083(1989)]. The growth of 3 He droplets shows a t

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Nuclear magnetic resonance studies of tunneling in quantum solids at very low temperatures

Cited by 3 publications

References 88 publications

Hydrogen atom quantum diffusion in solid parahydrogen: The H + N2O → cis-HNNO → trans-HNNO reaction

Hydrogen atom quantum diffusion in solid parahydrogen: The H + N2O → cis-HNNO → trans-HNNO reaction

Purely spatial diffusion of H atoms in solid normal- and para-hydrogen films

Phase separation in dilute solutions ofHe3in solidHe4

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