Phase transformations of the H/w(110) and H/Mo(110) surfaces

M. Altman; J. W. Chung; P. J. Estrup; J. M. Kosterlitz; J. Prybyla; D. Sahu; S. C. Ying

doi:10.1116/1.574182

Phase transformations of the H/w(110) and H/Mo(110) surfaces

M. Altman, J. W. Chung, P. J. Estrup, J. M. Kosterlitz, J. Prybyla, D. Sahu, S. C. Ying

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Abstract

We present results of combined theoretical and experimental studies of the surface phases produced by hydrogen adsorption on tungsten (110) and molybdenum (110) planes. We have formulated a theoretical model which has the following ingredients: (1) a possible adsorbate-induced lateral shift reconstruction of the substrate surface; (2) two-body and three-body interactions among hydrogen atoms; and (3) a coupling of the overlayer ordering to the substrate reconstruction. This model gives good agreement with the observed phase diagram for H/W( 110) which shows a (2x1) phase at low coverages and a (2x2) phase, as well as substrate reconstruction, at high coverages. In the case of H/Mo(110), for which no reconstruction is observed, the lack of a (2x1) phase suggests the presence of a strong three-body interaction among the adatoms.

Original language	English
Pages (from-to)	1045-1048
Number of pages	4
Journal	Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume	5
Issue number	4
DOIs	https://doi.org/10.1116/1.574182
Publication status	Published - 1 Jul 1987
Externally published	Yes

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title = "Phase transformations of the H/w(110) and H/Mo(110) surfaces",

abstract = "We present results of combined theoretical and experimental studies of the surface phases produced by hydrogen adsorption on tungsten (110) and molybdenum (110) planes. We have formulated a theoretical model which has the following ingredients: (1) a possible adsorbate-induced lateral shift reconstruction of the substrate surface; (2) two-body and three-body interactions among hydrogen atoms; and (3) a coupling of the overlayer ordering to the substrate reconstruction. This model gives good agreement with the observed phase diagram for H/W( 110) which shows a (2x1) phase at low coverages and a (2x2) phase, as well as substrate reconstruction, at high coverages. In the case of H/Mo(110), for which no reconstruction is observed, the lack of a (2x1) phase suggests the presence of a strong three-body interaction among the adatoms.",

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TY - JOUR

T1 - Phase transformations of the H/w(110) and H/Mo(110) surfaces

AU - Altman, M.

AU - Chung, J. W.

AU - Estrup, P. J.

AU - Kosterlitz, J. M.

AU - Prybyla, J.

AU - Sahu, D.

AU - Ying, S. C.

PY - 1987/7/1

Y1 - 1987/7/1

N2 - We present results of combined theoretical and experimental studies of the surface phases produced by hydrogen adsorption on tungsten (110) and molybdenum (110) planes. We have formulated a theoretical model which has the following ingredients: (1) a possible adsorbate-induced lateral shift reconstruction of the substrate surface; (2) two-body and three-body interactions among hydrogen atoms; and (3) a coupling of the overlayer ordering to the substrate reconstruction. This model gives good agreement with the observed phase diagram for H/W( 110) which shows a (2x1) phase at low coverages and a (2x2) phase, as well as substrate reconstruction, at high coverages. In the case of H/Mo(110), for which no reconstruction is observed, the lack of a (2x1) phase suggests the presence of a strong three-body interaction among the adatoms.

AB - We present results of combined theoretical and experimental studies of the surface phases produced by hydrogen adsorption on tungsten (110) and molybdenum (110) planes. We have formulated a theoretical model which has the following ingredients: (1) a possible adsorbate-induced lateral shift reconstruction of the substrate surface; (2) two-body and three-body interactions among hydrogen atoms; and (3) a coupling of the overlayer ordering to the substrate reconstruction. This model gives good agreement with the observed phase diagram for H/W( 110) which shows a (2x1) phase at low coverages and a (2x2) phase, as well as substrate reconstruction, at high coverages. In the case of H/Mo(110), for which no reconstruction is observed, the lack of a (2x1) phase suggests the presence of a strong three-body interaction among the adatoms.

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DO - 10.1116/1.574182

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JO - Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films

JF - Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films

IS - 4

ER -

Phase transformations of the H/w(110) and H/Mo(110) surfaces

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