کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9595543 | 1395941 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Growth and hydrogenation of ultra-thin Mg films on Mo(1Â 1Â 1)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
The growth and hydrogenation of ultra-thin magnesium overlayers have been investigated on a Mo(1Â 1Â 1) single crystal substrate. For increasing magnesium coverages we observe intermediate stages in the TPD and LEISS profiles, which illustrate the transition from one monolayer to multilayer growth. Hydrogen cannot be adsorbed on magnesium films under UHV conditions. However, when evaporating Mg in a hydrogen background, a hydrogen overlayer is seen to adsorb at the Mg surface, due to the catalytic interaction with the Mo(1Â 1Â 1) substrate and subsequent spill-over. We show that two monolayers of Mg are necessary to sustain this purely adsorbed state. Using predissociated hydrogen we show that the hydride formation is self-stabilizing and the hydride only decomposes at a temperature where a considerable desorption of magnesium occurs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 584, Issue 1, 10 June 2005, Pages 17-26
Journal: Surface Science - Volume 584, Issue 1, 10 June 2005, Pages 17-26
نویسندگان
Christopher W. Ostenfeld, Jon C. Davies, Tejs Vegge, Ib Chorkendorff,