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Article
Decomposition of the angular ESR spectra of fossil tooth enamel fragments
Radiation Measurements
  • Renaud Joannes-Boyau, Australian National University
  • Thomas Bodin, Australian National University
  • Rainer Grun, Australian National University
Document Type
Article
Publication Date
1-1-2010
Peer Reviewed
Peer-Reviewed
Abstract
The ESR spectra of a fragment of fossil tooth enamel were measured by rotating it in 10° increments over 360° around its three major axes. We used an automated simulated annealing (SA) procedure for the mathematical decomposition of the spectra. The SA approach is particularly robust in finding global solutions rather than getting stuck in local minima. All angular measurements could be fitted with four Gaussian lines, all of which could be attributed to components of CO2− radicals. The results imply that the tooth enamel fragment contains at least two different types of oriented CO2− radicals, plus about 9% of non-oriented CO2− radicals. The oriented components were tentatively attributed to axial and orthorhombic CO2− radicals. Their explicit locations in the crystal domains of the tooth enamel remain unresolved.
Citation Information

Joannes-Boyau, R, Bodin, T & Grun, R 2010, 'Decomposition of the angular ESR spectra of fossil tooth enamel fragments', Radiation Measurements, vol. 45, no. 1, pp. 887-898.

Published version available from:

http://dx.doi.org/10.1016/j.radmeas.2010.06.029