Surface melting of deuterium hydride thick films
- 1 January 1990
- journal article
- Published by EDP Sciences in Journal de Physique
- Vol. 51 (17) , 1929-1938
- https://doi.org/10.1051/jphys:0199000510170192900
Abstract
Quasi-elastic neutron scattering has been used to measure, below the bulk melting temperature, the thickness and the diffusion coefficient of the mobile surface layer of 8 and 10 layer thick films of deuterium hydride (HD) condensed on MgO(100). The measurements show that the close-packed surface of solid HD surface melts gradually, with the thickness of the melted layer increasing from 0.5 to 6 molecular layers as the temperature rises from 4 K to 0.05 K below the bulk melting temperature. The diffusion coefficients are in the 10-5 cm2 s-1 range indicating that the surface disordered film is liquid-likeKeywords
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