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 FachzeitschriftArtikelForschungBegutachtung

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

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helium atoms
adhesion
hydrogen
scattering
surface temperature
helium
room temperature
antimony
scattering cross sections
temperature
desorption
reflectance
adsorption
heating

Schlagwörter

    ASJC Scopus subject areas

    • !!Surfaces and Interfaces

    Fields of Expertise

    • Advanced Materials Science

    Dies zitieren

    Adhesion properties of hydrogen on Sb(111) probed by helium atom scattering. / Kraus, P.; Gösweiner, C.; Tamtögl, A.; Apolloner, F.; Ernst, W. E.

    in: Europhysics letters, Jahrgang 114, Nr. 5, 56001, 28.06.2016.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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    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 $\Sigma = (12 \pm 1)\ \unicode{8491}^{2}$ .",
    keywords = "Adsorption, Atom scattering, Atom surface interaction, Hydrogen, Semimetal",
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    TY - JOUR

    T1 - Adhesion properties of hydrogen on Sb(111) probed by helium atom scattering

    AU - Kraus, P.

    AU - Gösweiner, C.

    AU - Tamtögl, A.

    AU - Apolloner, F.

    AU - Ernst, W. E.

    PY - 2016/6/28

    Y1 - 2016/6/28

    N2 - 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 $\Sigma = (12 \pm 1)\ \unicode{8491}^{2}$ .

    AB - 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 $\Sigma = (12 \pm 1)\ \unicode{8491}^{2}$ .

    KW - Adsorption

    KW - Atom scattering

    KW - Atom surface interaction

    KW - Hydrogen

    KW - Semimetal

    M3 - Article

    VL - 114

    JO - Europhysics letters

    JF - Europhysics letters

    SN - 0295-5075

    IS - 5

    M1 - 56001

    ER -