High-Temperature Quantum–Classical Transition in Solid Methane

Zakharov, A. Yu.; Leont'eva, A. V.; Prokhorov, A. D.; Эренбург, А. И.

doi:10.1007/s10909-016-1705-7

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…It is worth mentioning that anomalies in the same temperature range have also been observed in other parameters of solid methane. As shown in [13,14] the transport and mechanical properties of solid methane undergo significant changes at temperatures around 50K [14]: in the 50K -90K temperature range solid methane is soft and sticky, but below 50K solid methane loses its stickiness and ductility and behaves more or less like an ordinary window glass. In [13] it was recently suggested that this change might be caused by quantum effects of rotational degrees of freedom and their collectivization.…”

Section: Discussionmentioning

confidence: 99%

“…As shown in [13,14] the transport and mechanical properties of solid methane undergo significant changes at temperatures around 50K [14]: in the 50K -90K temperature range solid methane is soft and sticky, but below 50K solid methane loses its stickiness and ductility and behaves more or less like an ordinary window glass. In [13] it was recently suggested that this change might be caused by quantum effects of rotational degrees of freedom and their collectivization. However, irrespective to the microscopic mechanism which governs this process, it is clear that dynamics of crystal defects such as dislocations, vacancies or impurities experience dramatic change in this temperature range.…”

Section: Discussionmentioning

confidence: 99%

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Recombination of radiation defects in solid methane: neutron sources and cryo-volcanism on celestial bodies

Kirichek

Savchenko

Lawson

et al. 2018

J. Phys.: Conf. Ser.

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Physicochemical properties of solid methane exposed to ionizing radiation have attracted significant interest in recent years. Here we present new trends in the study of radiation effects in solid methane. We particularly focus on relaxation phenomena in solid methane pre-irradiated by energetic neutrons and electron beam. We compare experimental results obtained in the temperature range from 10K to 100K with a model based on the assumption that radiolysis defect recombinations happen in two stages, at two different temperatures. In the case of slow heating up of the solid methane sample, irradiated at 10K, the first wave of recombination occurs around 20K with a further second wave taking place between 50 and 60K. We also discuss the role of the recombination mechanisms in "burp" phenomenon discovered by J. Carpenter in the late 1980s. An understanding of these mechanisms is vital for the designing and operation of solid methane moderators used in advanced neutron sources and could also be a possible explanation for the driving forces behind cryo-volcanism on celestial bodies.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Recombination of radiation defects in solid methane: neutron sources and cryo-volcanism on celestial bodies

Kirichek

Savchenko

Lawson

et al. 2018

J. Phys.: Conf. Ser.

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The rotation of methane molecules in the crystalline state above and below the temperature of the phase α-β transition

Prokhorov

Leont'eva

Dmitriev

2019

J. Phys.: Conf. Ser.

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The work is devoted to the study of rotational features of methane molecules in the methane solid state in different temperature ranges. We formulated earlier, the concept of the description of collective rotational motion of the CH 4 molecules with the use of a topon quasi-particle. This approach received a new experimental confirmation in papers by Yu. A. Dmitriev and N. P. Benetis on studying by electron paramagnetic resonance (EPR) quantum mechanical rotation of CH 3 radicals matrix isolated in solid methane and in a work by P. Pyykko using nuclear magnetic resonance (NMR) technique to test rotation of host molecules in methane at temperatures of orientational ordering (below the α−β transition). Comparison with the behavior of the CH 3 radical in other orientation-ordered matrices, CO 2, N 2, CO, N 2 O suggests that the observed change in the barrier at such low temperatures is associated with the reorientation of the methane matrix molecules, which, provided that their orientation ordering is preserved, is possible only as a result of collective tunnel rotation.

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High-Temperature Quantum–Classical Transition in Solid Methane

Cited by 2 publications

References 8 publications

Recombination of radiation defects in solid methane: neutron sources and cryo-volcanism on celestial bodies

Recombination of radiation defects in solid methane: neutron sources and cryo-volcanism on celestial bodies

The rotation of methane molecules in the crystalline state above and below the temperature of the phase α-β transition

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