Thermal conductivity and quantum diffusion in solid H2

Li, X.; Clarkson, David; Meyer, Horst

doi:10.1007/bf00683315

Cited by 10 publications

(10 citation statements)

References 14 publications

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“…Representative growth (above 1 K) and decay (below 1 K) rates of the singles spectrum [18] are presented in Fig. 3.…”

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confidence: 99%

“…3 explains the absence of this unusually long relaxation in HD, 4 He, and 3 He. In our experiment we allow clustering to ensue for up to two weeks at 20 mK so that no isolated ortho-H 2 singles or pairs remain in our samples at the beginning of each temperature sweep [18,19]. Thus, we are able to follow the unclustering process upon gradual warming of the torsion cell.…”

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confidence: 99%

“…T dependence of measured relaxation times, including NMR and thermal conductivity data from the literature[18]. signify the growth (T < 1 K) or decay (T > 1 K) rates of isolated orho-H 2 molecules.…”

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confidence: 99%

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Search for Superfluidity in Solid Hydrogen

2006

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A torsional oscillator study of solid para-hydrogen has been carried out down to 20 mK in a search for evidence of superfluidity. We found evidence of a possible phase transition, marked by an abrupt increase in the resonant period of oscillation and onset of extremely long relaxation times as the temperature was raised above 60 mK. In contrast to solid 4He, the change in the period for para-hydrogen is not a consequence of irrotational superflow. The long relaxation times observed suggest the effect is related to the motion of residual ortho-hydrogen molecules in the solid.

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“…Representative growth (above 1 K) and decay (below 1 K) rates of the singles spectrum [18] are presented in Fig. 3.…”

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confidence: 99%

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confidence: 99%

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Search for Superfluidity in Solid Hydrogen

2006

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“…Note, that a similar condition holds for quantum diffusion of ortho-hydrogen in a para-hydrogen matrix, where typical time constants for single phonon processes are of the order of tens of years, whereas the time scale for resonant multi-phonon transitions are of the order of hours. 54,57 We believe that a similar situation could be realized in proteins. If the frequency fluctuations in the absorption spectrum of the chromophore are associated with the low-energy transitions, then the number of transitions is directly proportional to the density of low energy excitations.…”

Section: B) Surface Tls Bring About Quite Specific Features: Independ...mentioning

confidence: 57%

Physics of Proteins at Low Temperature

Ponkratov

Friedrich

Vanderkooi

et al. 2004

Journal of Low Temperature Physics

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We present results of a hole burning study with thermal cycling and waiting time spectral diffusion experiments on a modified cytochrome - c protein in its native as well as in its denatured state. The experiments show features which seem to be characteristic for the protein state of matter and its associated dynamics at low temperature. The properties responsible for the observed patterns are organisation paired with randomness and, in addition, the finite size which gives rise to surface and solvent effects. We discuss some general model approaches which might serve as guide lines for understanding these features.Comment: To Appear in the Journal of Low Temperature Physics, 200

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“…Close symbols 1.5% < X < 3.4% and 0.9% < X < 1.1%. 15 Open symbols for X = 1 and 2%. 12 Cross 1.0% < X < 2.5%.…”

Section: Introductionmentioning

confidence: 99%

Phonon scattering in ortho-para hydrogen solid solutions (role of configurational relaxation)

Gorodilov

2003

Low Temperature Physics

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The experimental data on the thermal conductivity of ortho-parahydrogen solutions are analyzed on the basis of a relaxation-time model taking account of configurational relaxation of the ortho subsystem. The influence of configurational relaxation on the thermal conductivity is analyzed using resonance scattering of phonons by pair clusters of orthomolecules taking account of their rotational spectrum.

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Thermal conductivity and quantum diffusion in solid H2

Cited by 10 publications

References 14 publications

Search for Superfluidity in Solid Hydrogen

Search for Superfluidity in Solid Hydrogen

Physics of Proteins at Low Temperature

Phonon scattering in ortho-para hydrogen solid solutions (role of configurational relaxation)

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