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Scattering of hyperthermal argon atoms from clean and D-covered Ru(0001) surfaces
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10.1063/1.3518042
/content/aip/journal/jcp/134/3/10.1063/1.3518042
http://aip.metastore.ingenta.com/content/aip/journal/jcp/134/3/10.1063/1.3518042
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Angle-resolved flux distributions of Ar atoms (〈E i〉 ∼ 6.2 eV; θ i = 40°) scattered from (a) Ru(0001) and (b) Ru(0001)-(1×1)D. The angular distribution from the bare surface at T S = 180 K is replotted in the panel (b) as a dashed line. The scattered intensities are normalized to the intensity of the corresponding direct beam. The lines connecting the data points are intended to guide the eye.

Image of FIG. 2.
FIG. 2.

Angle-resolved flux distributions of Ar atoms (〈E i〉 ∼ 6.4 eV; θ i = 60°) scattered from (a) Ru(0001) and (b) Ru(0001)-(1×1)D. The angular distribution from the bare surface at T S = 180 K is replotted in the panel (b) as a dashed line. The scattered intensities are normalized to the intensity of the corresponding direct beam. The lines connecting the data points are intended to guide the eye.

Image of FIG. 3.
FIG. 3.

Angle-resolved final-to-initial energy ratios (〈E f〉/〈E i〉) of Ar scattered from (a) Ru(0001) and (b) Ru(0001)-(1×1)D for θ i = 40°, and from (c) Ru(0001) and (d) Ru(0001)-(1×1)D for θ i = 60°. In (b) and (d) the results from the bare surface at T S = 180 K are replotted as a dashed lines. The lines connecting the data points are intended to guide the eye. Two simple models are illustrated on the panels. Solid lines correspond to parallel momentum conservation and dashed-dotted lines represent the model of single-collision hard sphere scattering of Ar from an isolated ruthenium atom (mass ratio of 40/101).

Image of FIG. 4.
FIG. 4.

Angle-resolved flux distributions of Ar (〈E i〉 ∼ 6.5 eV) scattered from Ru(0001) and Ag(111) at (a) θ i = 40° and (b) θ i = 60°, and the corresponding angle-resolved 〈E f〉/〈E i〉 ratios from those surfaces at (c) θ i = 40° and (d) θ i = 60°. In panels (c) and (d), the dashed-dotted lines represent the models of single-collision hard sphere scattering of Ar from an isolated Ag atom (mass ratio of 40/108). T S was 600 K in all cases.

Image of FIG. 5.
FIG. 5.

Contour plots produced from Ar TOF spectra after normalization to a peak intensity of one: Ar scattered from (a) Ag(111) at θ i = 40° and T S = 600 K; (b) Ru(0001) at θ i = 40° and T S = 600 K; (c) from Ru(0001)-(1 × 1)D at θ i = 40° and T S = 114 K. The right-hand-side panels show some representative raw TOF spectra for the three surfaces and the associated two-component fits. The measurement for (a) and (b) were done at 400 Hz chopper frequency, and for (c) at 200 Hz chopper frequency. The times shown represent the flight time from the chopper to the ionizer (i.e., the trigger delay and QMS flight-time corrections have been applied).

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/content/aip/journal/jcp/134/3/10.1063/1.3518042
2011-01-20
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Scattering of hyperthermal argon atoms from clean and D-covered Ru(0001) surfaces
http://aip.metastore.ingenta.com/content/aip/journal/jcp/134/3/10.1063/1.3518042
10.1063/1.3518042
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