Molecular motion in solid H2 at high pressures

Sam Hyeon Lee, Mark S. Conradi, R. E. Norberg

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Solid molecular hydrogen has been studied with proton nuclear magnetic resonance in a diamond anvil cell. Pressures from 18 to 68 kbar were used, resulting in melting temperatures from 160 to 350 K and relative densities/0 as high as 3. At temperatures above 0.7Tmelt, translational self-diffusion narrows the resonance line. The pressure variation of the activation enthalpy H yields an activation volume of 5.70.6 cm3/mol or 63% of the molar volume, a reasonable value for a vacancy diffusion mechanism. The smooth variation of H/kTmelt with density also suggests that the diffusion mechanism remains the same for /0 between 1 and 3. The spin-lattice relaxation is controlled primarily by molecular reorientation. The observed density dependence T15/3 indicates that molecular electric quadrupole-quadrupole interactions cause reorientation, even at the high temperatures and densities of this work.

Original languageEnglish
Pages (from-to)12492-12498
Number of pages7
JournalPhysical Review B
Volume40
Issue number18
DOIs
Publication statusPublished - 1989 Jan 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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