Isotope Effect on Adsorbed Quantum Phases: Diffusion of H2 and D2 in Nanoporous Carbon

被引：37

作者：

Contescu, Cristian I. ^{[1
]}

Zhang, Hongxin ^{[1
]}

Olsen, Raina J. ^{[1
]}

Mamontov, Eugene ^{[2
]}

Morris, James R. ^{[1
]}

Gallego, Nidia C. ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

[2] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 23期

关键词：

HYDROGEN ISOTOPES; ADSORPTION; SEPARATION; DEUTERIUM; ENERGY;

D O I：

10.1103/PhysRevLett.110.236102

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Quasielastic neutron scattering of H-2 and D-2 in the same nanoporous carbon at 10-40 K demonstrates extreme quantum sieving, with D-2 diffusing up to 76 times faster. D-2 also shows liquidlike diffusion while H-2 exhibits Chudley-Elliott jump diffusion, evidence of their different relationships with the local lattice of adsorption sites due to quantum effects on intermolecular interactions. The onset of diffusion occurs at 22-25 K for H-2 and 10-13 K for D-2. At these temperatures, H-2 and D-2 have identical thermal de Broglie wavelengths that correlate with the dominant pore size.

引用

页数：5

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