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Determination of 16O and 18O sensitivity factors and charge-exchange processes in low-energy ion scattering
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10.1063/1.4758699
/content/aip/journal/apl/101/15/10.1063/1.4758699
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/15/10.1063/1.4758699

Figures

Image of FIG. 1.
FIG. 1.

Energy spectra for 3 keV He+ scattered over 145° by an exchanged SiO2 sample (18O concentrations of 97% and 3%) using an Ep of 1 keV.

Image of FIG. 2.
FIG. 2.

Scattered ion yields for 16O and 18O isotopes in SiO2 samples with 100% isotopic enrichment at different Ei. Closed symbols correspond to an Ep of 3 keV, open symbols correspond to an Ep of 1 keV.

Image of FIG. 3.
FIG. 3.

Natural logarithm of the LEIS signal (peak areas) corrected for the differential cross-sections (σ) versus the sum of the reciprocal velocities before and after scattering for He+ scattered by SiO2. The yields were extrapolated to 100% O isotopic composition in the different samples. (a) 16O in 100%-enriched Si16O2, (b) 18O in 100%-enriched Si18O2, and (c) Si in both SiO2 samples. Circles: Ep 3 keV; squares: Ep 1 keV.

Image of FIG. 4.
FIG. 4.

Ion fractions for Si, 16O and 18O in 100%-enriched SiO2. Dashed lines: AN mechanism; solid lines: CIN mechanism.

Tables

Generic image for table
Table I.

Characteristic velocities (Vc) and intercepts (a) as estimated from the linear fittings of the corrected scattering yields versus the sum of the reciprocal velocities of the He+ ions scattered by SiO2, extrapolated for 100% O isotopic composition. The straight lines for AN in O isotopes was defined by the intercept value (a) and the corrected scattering yield at Ei = 600–800 eV, assuming that CIN contribution at these E can be neglected.

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/content/aip/journal/apl/101/15/10.1063/1.4758699
2012-10-10
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Determination of 16O and 18O sensitivity factors and charge-exchange processes in low-energy ion scattering
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/15/10.1063/1.4758699
10.1063/1.4758699
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