AcetyleneC2H2Adsorbed onto MgO(001): Structure and Thermodynamics

D. Ferry, J. Suzanne, P. N. M. Hoang and C. Girardet
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D. Ferry: CRMC2-CNRS, (Also associated with the Universities of Aix-Marseille 2 and 3.) Départment de Physique, Faculté des Sciences de Luminy, Case 901, 13288 Marseille Cedex 9, France
J. Suzanne: CRMC2-CNRS, (Also associated with the Universities of Aix-Marseille 2 and 3.) Départment de Physique, Faculté des Sciences de Luminy, Case 901, 13288 Marseille Cedex 9, France
P. N. M. Hoang: Laboratoire de Physique Moléculaire (URA-CNRS 772), Faculté des Sciences La Bouloie, Université de Franche-Comté, 25030 Besançon Cedex, France
C. Girardet: Laboratoire de Physique Moléculaire (URA-CNRS 772), Faculté des Sciences La Bouloie, Université de Franche-Comté, 25030 Besançon Cedex, France

Surface Review and Letters (SRL), 1998, vol. 05, issue 01, 353-357

Abstract: Structural and thermodynamical LEED experiments were performed on MgO(001) single crystal cleavedin situunder ultrahigh vacuum conditions within the temperature range of 40–94 K. We observe a commensurate (2 × 2) herringbone structure containing two molecules and having two glide planes. The isosteric heat of adsorptionQst= 6.9 ± 0.4 kcal·mole-1and lateral interoction energyQ//= 3.1 ± 0.4 kcal·mole-1have been measured and compared with semiempirical potential calculations. The influence of the molecular motions on the calculated isosteric heat of adsorption is evaluated to take into account temperature effects.

Date: 1998
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DOI: 10.1142/S0218625X98000657

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