Publication detail

Quantitative analysis of calcium and fluorine by high-sensitivity low-energy ion scattering: Calcium fluoride

PRŮŠA, S. BÁBÍK, P. ŠIKOLA, T. BRONGERSMA, H.

Original Title

Quantitative analysis of calcium and fluorine by high-sensitivity low-energy ion scattering: Calcium fluoride

Type

journal article in Web of Science

Language

English

Original Abstract

Low-energy ion scattering (LEIS) probes the atomic composition of the outer surface. Well-defined reference samples are used for the quantitation. For elements like fluorine and calcium, it is not easy to find suitable, clean, and homogeneous references, since fluorine is a gas and calcium is a very reactive metal. In contrast to surface analytic techniques such as XPS, the extreme surface sensitivity of LEIS makes it difficult to use stable compounds like CaF(2)as reference, since these compounds are not homogeneous at the atomic scale. With LEIS, CaF(2)is not expected to show an atomic ratio F/Ca = 2.0. Thus, before CaF(2)can be used as reference, its atomic surface concentrations have to be determined. Here, 3-keV He(+)scattering by a LiF(001) single crystal, an evaporated layer of Ca, and a Cu foil are used as basic references. High-purity CaF(2)is available in two forms: a single crystal and a powder. For a practical reference, powders are preferred, since if bulk impurities segregate to the surface, they will be dispersed over a large surface area. It is found that both CaF2(111) and powder have similar F/Ca atomic ratios. This confirms the F termination for both samples. For the powder, the F and Ca signals are reduced by 0.77 +/- 0.03 in comparison with those for the single crystal. The atomic sensitivity factors and relative sensitivity factors have been determined for F, Ca, and Cu.

Keywords

Ca; calcium fluoride; Cu; LEIS; LiF(001); surface termination

Authors

PRŮŠA, S.; BÁBÍK, P.; ŠIKOLA, T.; BRONGERSMA, H.

Released

4. 9. 2020

Publisher

WILEY

Location

HOBOKEN

ISBN

0142-2421

Periodical

Surface and Interface Analysis

Year of study

52

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1000

Pages to

1003

Pages count

4

URL

https://doi.org/10.1002/sia.6889

BibTex

@article{BUT166049,
  author="Stanislav {Průša} and Pavel {Bábík} and Tomáš {Šikola} and Hidde H. {Brongersma}",
  title="Quantitative analysis of calcium and fluorine by high-sensitivity low-energy ion scattering: Calcium fluoride",
  journal="Surface and Interface Analysis",
  year="2020",
  volume="52",
  number="1",
  pages="1000--1003",
  doi="10.1002/sia.6889",
  issn="0142-2421",
  url="https://doi.org/10.1002/sia.6889"
}