X-Ray Standing Waves on Surfaces

Abruña, Héctor D.

doi:10.21236/ada265265

Cited by 1 publication

(1 citation statement)

References 16 publications

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“…These lattices have been characterized by LEED, [6][7][8][9][10][11][12] ADAM, 13 STM, [14][15][16] and Surface X-ray Scattering ͑SXS͒. [17][18][19][20][21] The same type of iodine adlayer on Pt͑111͒ was found for preparations from gas phase [12][13][14] and from aqueous solution. [6][7][8][9][10][11]15,16 Experimental data also show that an iodine adlayer with ͑3 ϫ 3͒ unit cell structure can form two distinct lattices, 10,[13][14][15][16] in which iodine-iodine interatomic distance ͑4.162 Å͒ and surface coverage are the same, but iodine adatoms possess different registries.…”

Section: Introductionmentioning

confidence: 98%

Detailed characterization of (3×3) iodine adlayer on Pt(111) by unequal-sphere packing model

Tkatchenko¹,

Batina²

2005

The Journal of Chemical Physics

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A simple unequal-sphere packing model is applied to study the iodine ͑3 ϫ 3͒ adlayer on the Pt͑111͒ surface. By using a newly introduced parameter, defined as the average adsorbate height, three characteristic adlattices, ͑3 ϫ 3͒-sym, ͑3 ϫ 3͒-asym, and ͑3 ϫ 3͒-lin, have been selected and characterized in great detail, including the exact adatom registry. The ͑3 ϫ 3͒-sym iodine adlattice, observed in many experimental studies, appears to be, on average, the closest one to the substrate surface. A special contour plot of average adsorbate height vs X and Y positions of the ͑3 ϫ 3͒ iodine unit cell indicates the existence of two local minima, which are related to preferential formation of ͑3 ϫ 3͒-sym and ͑3 ϫ 3͒-asym iodine adlattices. Our model gives good agreement with experimental findings, and explains the mechanism of preferential appearance of ͑3 ϫ 3͒-sym and ͑3 ϫ 3͒-asym structures.

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