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Department of Materials Science, Imperial College of Science and Technology, Prince Consort Road, London, UK

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...HREF="footnode.html#9"> 

Present address: Physics Department, Oregon State University, Corvallis, Oregon, USA

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...A.H.Harker

Centre for Materials Research, Department of Physics and Astronomy, University College London, Gower Street, London, UK

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...eV

1 $\mbox{\AA}$ = 10^{- 10} m ; 1 eV = 1.602 x 10^{- 19} J .

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...$\mbox{\AA}$²)

Atomic mass unit = 1.66 x 10^{- 27} kg .

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