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RBF neural networks for solving the inverse problem of backscattering spectra

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Abstract

This paper investigates a new method to solve the inverse problem of Rutherford backscattering (RBS) data. The inverse problem is to determine the sample structure information from measured spectra, which can be defined as a function approximation problem. We propose using radial basis function (RBF) neural networks to approximate an inverse function. Each RBS spectrum, which may contain up to 128 data points, is compressed by the principal component analysis, so that the dimensionality of input data and complexity of the network are reduced significantly. Our theoretical consideration is tested by numerical experiments with the example of the SiGe thin film sample and corresponding backscattering spectra. A comparison of the RBF method with multilayer perceptrons reveals that the former has better performance in extracting structural information from spectra. Furthermore, the proposed method can handle redundancies properly, which are caused by the constraint of output variables. This study is the first method based on RBF to deal with the inverse RBS data analysis problem.

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Abbreviations

RBF:

Radial basis function

RBS:

Rutherford backscattering

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Acknowledgments

The author (Michael M. Li) would like to acknowledge the financial support of this work from a Research Grant of the Faculty of Business and Informatics, Central Queensland University, Australia. The authors would also like to thank the anonymous reviewers for their valuable comments and advice.

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Authors and Affiliations

  1. School of Computing Sciences, Faculty of Business and Informatics, Central Queensland University, Rockhampton, QLD, 4702, Australia

    Michael M. Li, Brijesh Verma, Xiaolong Fan & Kevin Tickle

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  1. Michael M. Li
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  2. Brijesh Verma
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  3. Xiaolong Fan
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  4. Kevin Tickle
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Correspondence to Michael M. Li.

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Li, M.M., Verma, B., Fan, X. et al. RBF neural networks for solving the inverse problem of backscattering spectra. Neural Comput & Applic 17, 391–397 (2008). https://doi.org/10.1007/s00521-007-0138-2

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  • DOI: https://doi.org/10.1007/s00521-007-0138-2

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