Adhesion properties of hydrogen on Sb(111) probed by helium atom scattering

P. Kraus, C. Gösweiner, A. Tamtögl, F. Apolloner, W. E. Ernst

Publikation: Beitrag in einer FachzeitschriftArtikel

Abstract

We have carried out a series of helium atom scattering measurements in order to characterise the adsorption properties of hydrogen on antimony(111). Molecular hydrogen does not adsorb at temperatures above 110 K in contrast to pre-dissociated atomic hydrogen. Depending on the substrate temperature, two different adlayer phases of atomic hydrogen on Sb(111) occur. At low substrate temperatures (110 K), the deposited hydrogen layer does not show any ordering while we observe a perfectly ordered $(1\times 1)$ H/Sb(111) structure for deposition at room temperature. Furthermore, the amorphous hydrogen layer deposited at low temperature forms an ordered overlayer upon heating the crystal to room temperature. Hydrogen starts to desorb at $T_m = 430\ \text{K}$ which corresponds to a desorption energy of $E_{des}=(1.33\pm0.06)\ \text{eV}$ . Using measurements of the helium reflectivity during hydrogen exposure at different surface temperatures, we conclude that the initial sticking coefficient of atomic hydrogen on Sb(111) decreases with increasing surface temperature. Furthermore, the scattering cross-section for the diffuse scattering of helium from hydrogen on Sb(111) is determined as $\Sigma = (12 \pm 1)\ \unicode{8491}^{2}$ .
Originalspracheenglisch
Aufsatznummer56001
FachzeitschriftEurophysics letters
Jahrgang114
Ausgabenummer5
PublikationsstatusVeröffentlicht - 28 Jun 2016

ASJC Scopus subject areas

  • !!Surfaces and Interfaces

Fields of Expertise

  • Advanced Materials Science

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