Decomposition of the angular ESR spectra of fossil tooth enamel fragments

Renaud Joannes-Boyau*, Thomas Bodin, Rainer Grün

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    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.

    Original languageEnglish
    Pages (from-to)887-898
    Number of pages12
    JournalRadiation Measurements
    Volume45
    Issue number8
    DOIs
    Publication statusPublished - Sept 2010

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