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I O N                       Tuesday, 20 May 1997        Vol. 97 : Num. 004

[none]

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From: N.Barradas@surrey.ac.uk (Nuno P Barradas)
Date: Mon, 19 May 97 14:11 BST
Subject: [none]

Advance in Thin Film Analysis by RBS

Rutherford backscattering spectra can easily be calculated for any given
structure.  However, current techniques for interpretation of RBS data
depend on trial and error simulations from guessed structures.  Skilled
analysts are good at guessing!

We have developed a code to solve the inverse RBS problem of automatically
obtaining the structure from the spectrum.  This will appear in Applied
Physics Letters shortly (abstract appended),  and will be available and
described in more detail with examples at the IBA-13 conference in Lisbon,
July28 - August1.


Simulated annealing analysis of Rutherford backscattering data

N.P. Barradas, C. Jeynes, and R.P. Webb

The combinatorial optimisation simulated annealing algorithm is applied to
the analysis of Rutherford backscattering data. The analysis is fully
automatic, i.e. it does not require time-consuming human intervention. The
algorithm is tested on a complex iron-cobalt silicide spectrum, and all the
relevant features are successfully determined. The total analysis time using
a PC 486 processor running at 100 MHz is comparable to the data collection
time, which opens the way for on-line automatic analysis.

Preprints of the paper can be obtained by request to Nuno Barradas:
N.Barradas@surrey.ac.uk (please specify if you have pkzip and uudecode).

END
_______________________________________________________________________
Nuno Pessoa Barradas             | On one point we were all agreed, and
School of Electronic Engineering | that was that, come what might, we
Information Technology and Maths | would go through with this job to
University of Surrey             | the bitter end.
Guildford, Surrey GU2 5XH, UK    | 
Tel: +44 (0)1483 259827          | 
Fax:             534139          | 


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End of I O N V97 #4
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