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Effect of long duration UV irradiation on diamondlike carbon surfaces in the presence of a hydrocarbon gaseous atmosphere
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10.1063/1.3517832
/content/aip/journal/jap/108/11/10.1063/1.3517832
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/11/10.1063/1.3517832
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic overview of the ILENA apparatus at the University of Bern. Positive ions are extracted from a Nier type ion source and after being mass analyzed they are scattered from the DLC sample. The distribution of scattered particles is finally recorded with a 2D imaging MCP detector.

Image of FIG. 2.
FIG. 2.

Left: contour plot of the angular scattering distribution of 1000 eV recorded by the imaging MCP detector after an UV irradiation time of 2 min by using the broad-band deuterium lamp. The bold line indicates the 50% level. Right: same data displayed in three-dimensions.

Image of FIG. 3.
FIG. 3.

UV spectrum of the broad-band deuterium lamp in the range of 112–370 nm.

Image of FIG. 4.
FIG. 4.

Angular scattering (FWHM) as function UV irradiation time vs for of 500 eV using the narrow-band discharge lamp. Measurement uncertainties of ±1° for angular scattering. No significant changes in the angular scattering due to UV irradiation are visible. Furthermore, no significant differences between measurement campaign A and B, C are observed. Solid and dashed lines give linear regressions to the data of campaign C.

Image of FIG. 5.
FIG. 5.

Angular scattering (FWHM) in polar direction of atomic oxygen using the broad-band deuterium lamp. Measurement uncertainties of ±1° for angular scattering. Significant changes after UV exposure of 1440 min are visible. The solid and dashed lines represent linear regressions.

Image of FIG. 6.
FIG. 6.

FWHM of angular scattering in polar direction of neon using the broad-band deuterium lamp. Measurement uncertainties of ±0.5° for angular scattering. Significant changes occurred after UV irradiation time of 1440 min. The solid and dashed lines represent linear regressions.

Image of FIG. 7.
FIG. 7.

Negative ionization yields of 500 eV of the three measurement campaigns A, B, and C by using the narrow-band discharge lamp. Measurement uncertainties of ±1% for negative ionization yield. The negative ionization yields begin to stagnate at about 14% (see dashed line). Sputtering background is subtracted.

Image of FIG. 8.
FIG. 8.

Negative ionization yield of atomic oxygen by using the broad-band deuterium lamp. Measurement uncertainties of ±1% for negative ionization yield. Sputtering background is subtracted. After each UV irradiation cycle the negative ionization yields increased.

Image of FIG. 9.
FIG. 9.

Negative ionization yields of neon by using the broad-band deuterium lamp. Measurement uncertainties of ±0.5% for negative ionization yield. In contrast to the measurements of negative ionization yields of atomic oxygen using the broad-band deuterium lamp (Fig. 8), no increase in the yields after each UV irradiation cycle is measured.

Image of FIG. 10.
FIG. 10.

Mass spectrum of the hydrocarbonaceous crust accumulated on the diamondlike CS during the UV campaign by using the deuterium lamp as UV source is shown, using laser intensities near threshold for ion desorption. On the top right of the figure, a blow-up of the mass range of 14 to 32 is displayed. Due to saturation of the intensity of the masses 23 and 39 both have to be thought ten times higher in intensity compared to the other masses as displayed in the figure.

Image of FIG. 11.
FIG. 11.

Mass spectrum of a new and uncontaminated CS is shown for the same experimental conditions as used in Fig. 10. On the top right, a blow-up of the mass range of 1 to 200 amu is displayed. Only electronic background as measured, in stark contrast the measurements shown in to Fig. 10.

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/content/aip/journal/jap/108/11/10.1063/1.3517832
2010-12-13
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effect of long duration UV irradiation on diamondlike carbon surfaces in the presence of a hydrocarbon gaseous atmosphere
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/11/10.1063/1.3517832
10.1063/1.3517832
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