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The interaction of hyperthermal nitrogen with N-covered Ag(111)
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10.1063/1.3615520
/content/aip/journal/jcp/135/7/10.1063/1.3615520
http://aip.metastore.ingenta.com/content/aip/journal/jcp/135/7/10.1063/1.3615520
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Angular-resolved density distributions of N atoms (〈E i 〉 ∼ 4.3 eV; θ i = 60°) scattered from bare and N-covered Ag(111) at T S = 500 K and 300 K, respectively. The scattered intensities have been normalized to the intensity of the corresponding direct beam. (b) Angle-resolved ratios of final-to-initial energy (〈E f〉/〈E i〉) for N atoms scattered from the bare and N-covered surfaces. The solid line represents the model of single-collision hard-sphere scattering of the incident atoms from an isolated “silver” atom (mass ratio of m N/M Ag = 14/108).

Image of FIG. 2.
FIG. 2.

N2 (〈E i 〉 ∼ 5.6 eV; θ i = 60°) angular intensity distribution from the bare and N-covered surfaces. These distributions were obtained by integrating the TOF distribution recorded at each outgoing angle. The data have been normalized to the intensity of the corresponding direct beam distribution.

Image of FIG. 3.
FIG. 3.

A series of N2 TOF spectra (thin black lines) collected from the N-covered surface at T S = 300 K at various θ f (θ i = 60°). The fitted curves (thick black lines) are based on the assumption of a single shifted MB distribution arising from scattering of N2. Corresponding spectra collected from the bare surface at T S = 500 K are also shown as red lines in the panels for θ f = (a) 0°, (b) 15°, (c) 30°, and (f) 60°. The chopper frequency was 400 Hz.

Image of FIG. 4.
FIG. 4.

Angle-resolved 〈E f〉/〈E i〉 ratios as a function of θ f for N2 scattering from the N-covered surface (filled circles). The values were derived from the single shifted MB distribution fittings that are illustrated in Fig. 3. The solid line represents the model of single-collision hard-sphere scattering of the incident atoms from an isolated “silver” atom (mass ratio of m N2/M Ag = 28/108). The broken line corresponds to parallel momentum conservation. The open triangles are the corresponding 〈E f〉/〈E i〉 values derived from TOF spectra acquired from the clean surface.

Image of FIG. 5.
FIG. 5.

N2 TOF spectra collected from the N-covered surface at T S = 300 K (same spectra as shown in Fig. 3). These have been fitted with two shifted MB distributions under the assumption that both originate from scattering of incident N2.

Image of FIG. 6.
FIG. 6.

Angle-resolved 〈E f〉/〈E i〉 ratios as a function of θ f for N2 scattering from the N-covered surface at T S = 300 K. These values were derived from the fitting with two shifted MB distributions illustrated in Fig. 5. The solid line represents the model of single-collision hard-sphere scattering of the incident N2 from an isolated “silver” atom (mass ratio of m N2/M Ag = 28/108). The broken line corresponds to parallel momentum conservation.

Image of FIG. 7.
FIG. 7.

N2 TOF spectrum measured for θ f = 0° (T S = 300 K; θ i = 60°) compared with a simulated 300 K MB distribution (dashed line), which assumes incident N2 trapping on the surface followed by thermal desorption. In addition, the results of fitting the spectrum with two shifted MB distributions under the assumption that the measured N2 is the result of a direct recombination reaction involving incident N atoms are shown. The chopper frequency was 200 Hz.

Image of FIG. 8.
FIG. 8.

Intensity and energy distributions determined from two-component fittings of the N2 TOF distributions measured for θ f = 0–45°. (a) and (b) show angle-resolved N2 intensity and energy distributions, respectively, that were derived based on the assumption of two N2 components at these outgoing angles, both originating from recombination reactions involving incident N atoms (〈E i〉 ∼ 4.3 eV). (c) and (d) show the corresponding distributions derived on the assumption of two N2 components, both originating from scattering of incident N2 molecules (〈E i〉 ∼ 5.6 eV).

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/content/aip/journal/jcp/135/7/10.1063/1.3615520
2011-08-18
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The interaction of hyperthermal nitrogen with N-covered Ag(111)
http://aip.metastore.ingenta.com/content/aip/journal/jcp/135/7/10.1063/1.3615520
10.1063/1.3615520
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