Quantitative structural study of an Na–O coadsorption phase on Al(111) using X-ray standing waves

Scragg, G.; Kerkar, M.; Ettema, A.R.H.F.; Woodruff, D.P.; Cowie, Bruce C. C.; Daïmellah, A.; Turton, S.; Jones, Robert G.

doi:10.1039/ft9959103555

Cited by 4 publications

(2 citation statements)

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“…The range of adsorbates studied on metal surfaces is quite different from that on semiconductors and reflects differences in the underlying scientific motivation. For example, investigations of Na and O coadsorption on Al (111) [202,203] were motivated by a desire to understand the effect of alkali adatoms in promoting oxidation of this surface. On the other hand, there have been a number of structure determinations of pure alkali metals on metals, Al(111)/Na [177,204], Al (111)/Rb [177,205], Cu(110)/Rb [206], Cu(111)/Rb [207,208], Fe(100)/K [209], Fe(110)/K [210], motivated by a desire to understand these 'simple' chemisorption systems; interest was further fuelled by the surprising finding on Al (111) that alkali atoms may occupy atop sites, or even occupy substitutional sites to form surface alloy layers, despite these metals being immiscible in the bulk.…”

Section: Adsorbed Layers On Metalsmentioning

confidence: 99%

Surface structure determination using x-ray standing waves

Woodruff¹

2005

Rep. Prog. Phys.

194

237

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The technique of x-ray standing waves as a means of structure determination is reviewed with special emphasis on its application to the investigation of adsorbed atoms and molecules at well-characterized single crystal surfaces in ultra-high vacuum. Topics covered include: the physical principles of the method and the underlying theory; methods of detection of the x-ray absorption and their relative merits; the specific advantages of photoelectron detection together with a description of the modified method of data analysis and its underlying physical basis (required to account for non-dipolar angular effects in the photoemission process); some practical issues of data analysis and interpretation including recent developments in the use of structural 'imaging' by direct inversion of the measured structural parameters. A broad survey of applications is included covering atomic and molecular adsorbates on semiconductors and metals as well as the use of the technique to obtain site-specific electronic structure information. Some comments on likely future developments and applications are given.

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Section: Adsorbed Layers On Metalsmentioning

confidence: 99%

Surface structure determination using x-ray standing waves

Woodruff¹

2005

Rep. Prog. Phys.

194

237

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“…Although there have been extensive studies of the influence of the role of adsorbed alkali metals on molecular dissociation and reaction rates (e.g. [1]) and a few related structural studies, notably of CO/alkali [2][3][4] and O/alkali [5][6][7] coadsorption, there appear to be few studies of alkali and halogen coadsorption. Some exceptions include K/Cl coadsorption on Ag(100) [8], RbCl deposition on Si(100) and W(110) [9], Na/Br coadsorption on WSe 2 (0001) [10] and Cs/Cl coadsorption on Si(100) [11].…”

Section: Introductionmentioning

confidence: 99%

Structural study of Rb and Cl coadsorption on Cu(111): a case of overlayer compound formation

Lüdecke

Skordas

Jackson

et al. 1997

J. Phys.: Condens. Matter

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A structural study of the adsorption of Rb on a Cu(111)( √ 3 × √ 3)R30 • -Cl surface has been conducted using normal-incidence x-ray standing-wavefield absorption at both the Cl and Rb surface atoms. The results indicate reaction of the coadsorbates to form an overlayer of approximately 1.2 ML of RbCl(100) which is essentially incommensurate with the substrate. The RbCl-Cu outermost layer spacing is similar to that seen for pure Rb adsorption on Cu(111). This RbCl layer is spread over the surface and not agglomerated into thicker islands. The results are consistent with prior characterization of the system by Auger electron spectroscopy and temperature-programmed desorption, and with STM studies of NaCl deposition on Al(111).

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