Progress of Cryogenics and Isotopes Separation , ISSN: 1582-2575
1998, Volume 1, Issue 1+2

Investigarea experimentala a factorului Debye-Waller in imprastierea Hidrogenului si Deuteriului pe suprafete monocristaline de Cu {111}

Abstract

Starting from the usual mathematical expression for Debye-Waller factor, a surface temperature and momentum transfer dependence of the specular scattering peak Intensity- considered as a measure of the elastic part of the interaction process has been experimental investigated. In a small Molecular beam scattering system, designed and built in our laboratories, Hydrogen and Deuterium beam scattering experiments from Cu[111] single-crystal surface has been carried out. General consideration about our experimental setup has been made in the paper. The experiments for different surface temperatures and different incident angle for Hydrogen and Deuterium incident beams has been carried out. According to the experimental results, the surface temperature dependence of the specular peak intensity has been plotted and considered as a first base of discussion for our investigation. The deviation from the surface temperature linear dependence of the l_sp for these angular distribution, in the 120-400 K range has been numerically evaluated, both for Hydrogen and Deuterium beams.