The calculation of ion fractions in LEIS

G. Verbist; H. H. Brongersma; J. T. Devreese

doi:10.1016/0168-583X(92)95535-Y

The calculation of ion fractions in LEIS

G. Verbist
, H. H. Brongersma
, J. T. Devreese

Photonics and Semiconductor Nanophysics

Research output: Contribution to journal › Article › Academic › peer-review

8 Citations (Scopus)

Abstract

We discuss different ways of calculating ion fractions for LEIS-type experiments: (i) parametrizations, and (ii) quasi-ab-initio models. Among the different parametrizations of the neutralization rates the Hagstrum, Godfrey-Woodruff and the unified model are compared. For surfaces containing different types of atoms, e.g. NaCl, it is not possible to determine the neutralization constants uniquely. This is related to the use of relative ion fractions. For the absolute ion fractions there is a convincing agreement between DISC-experiments for He⁺ → Si scattering and a theoretical calculation on the basis of the quasi-ab-initio Muda-Newns model.

Original language	English
Pages (from-to)	572-575
Number of pages	4
Journal	Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
Volume	64
Issue number	1-4
DOIs	https://doi.org/10.1016/0168-583X(92)95535-Y
Publication status	Published - 2 Feb 1992

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abstract = "We discuss different ways of calculating ion fractions for LEIS-type experiments: (i) parametrizations, and (ii) quasi-ab-initio models. Among the different parametrizations of the neutralization rates the Hagstrum, Godfrey-Woodruff and the unified model are compared. For surfaces containing different types of atoms, e.g. NaCl, it is not possible to determine the neutralization constants uniquely. This is related to the use of relative ion fractions. For the absolute ion fractions there is a convincing agreement between DISC-experiments for He+ → Si scattering and a theoretical calculation on the basis of the quasi-ab-initio Muda-Newns model.",

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AU - Verbist, G.

AU - Brongersma, H. H.

AU - Devreese, J. T.

PY - 1992/2/2

Y1 - 1992/2/2

N2 - We discuss different ways of calculating ion fractions for LEIS-type experiments: (i) parametrizations, and (ii) quasi-ab-initio models. Among the different parametrizations of the neutralization rates the Hagstrum, Godfrey-Woodruff and the unified model are compared. For surfaces containing different types of atoms, e.g. NaCl, it is not possible to determine the neutralization constants uniquely. This is related to the use of relative ion fractions. For the absolute ion fractions there is a convincing agreement between DISC-experiments for He+ → Si scattering and a theoretical calculation on the basis of the quasi-ab-initio Muda-Newns model.

AB - We discuss different ways of calculating ion fractions for LEIS-type experiments: (i) parametrizations, and (ii) quasi-ab-initio models. Among the different parametrizations of the neutralization rates the Hagstrum, Godfrey-Woodruff and the unified model are compared. For surfaces containing different types of atoms, e.g. NaCl, it is not possible to determine the neutralization constants uniquely. This is related to the use of relative ion fractions. For the absolute ion fractions there is a convincing agreement between DISC-experiments for He+ → Si scattering and a theoretical calculation on the basis of the quasi-ab-initio Muda-Newns model.

UR - https://www.scopus.com/pages/publications/0347715551

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SN - 0168-583X

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JO - Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms

JF - Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms

IS - 1-4

ER -

The calculation of ion fractions in LEIS

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