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STRUCTURAL INVESTIGATION OF RB ADSORPTION ON AL(111) USING NORMAL INCIDENCE STANDING X-RAY WAVE-FIELD ABSORPTION TRIANGULATION
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UNSPECIFIED (1992) STRUCTURAL INVESTIGATION OF RB ADSORPTION ON AL(111) USING NORMAL INCIDENCE STANDING X-RAY WAVE-FIELD ABSORPTION TRIANGULATION. In: 38TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC, SEATTLE, WA, NOV 11-15, 1991. Published in: JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, 10 (4 Part 3). pp. 2148-2153. ISSN 0734-2101.
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Abstract
The adsorption site, and adsorbate-substrate bondlength, has been investigated for the adsorption system A1(111)/Rb, using normal incidence standing x-ray wavefield absorption (NISXW), over a range of coverages from 0. 12 to 0. 33 ML including the ordered (2 X 2) and (square-root 3 X square-root 3)R30-degrees phases. By measuring both (111) and (111BAR) Bragg reflections in NISXW we obtain Rb-Al layer spacings in two real space directions and can therefore fully determine the adsorption structure by triangulation. For all phases we find adsorption in the atop sites, with a coverage-independent bondlength corresponding to an effective radius for the adsorbed Rb of 1.70+/-0.10 angstrom, significantly closer to the ionic (1.48 angstrom) than the metallic (2.43 angstrom) value. The NISXW results also show that the adsorbed Rb atoms have large vibrational amplitudes parallel. to the surface which may be associated with the atop site adsorption.
Item Type: | Conference Item (UNSPECIFIED) | ||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) Q Science > QC Physics |
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Journal or Publication Title: | JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS | ||||
Publisher: | AMER INST PHYSICS | ||||
ISSN: | 0734-2101 | ||||
Official Date: | July 1992 | ||||
Dates: |
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Volume: | 10 | ||||
Number: | 4 Part 3 | ||||
Number of Pages: | 6 | ||||
Page Range: | pp. 2148-2153 | ||||
Publication Status: | Published | ||||
Title of Event: | 38TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC | ||||
Location of Event: | SEATTLE, WA | ||||
Date(s) of Event: | NOV 11-15, 1991 |
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