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Characterization of ancient and modern papers by CW-EPR spectroscopy

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Abstract

Several old (15th to 18th century), new (1900–1950) and recently produced (after 1990) papers have been investigated by X-band continuous-wave electron paramagnetic resonance (EPR) spectroscopy. Signals from Cu(II), Fe(III), Mn(II) and radicals are apparent. A clear-cut distinction is observed between recently produced papers and the other samples: recent papers show just EPR signals from Mn(II) and sometimes small signals from Fe(III) in rhombic site, while the older samples show usually strong signals from Fe(III), Mn(II), Cu(II) and radicals. Furthermore, Mn(II) EPR signals from recent papers are characterized by small zero-field splitting (ZFS) parameters, indicating Mn(II) in high-symmetry sites, while older samples show broader Mn(II) EPR signals, typical for Mn(II) in low-symmetry sites (increased ZFS parameters).

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Authors and Affiliations

  1. Department of Chemistry, University of Padova, via Marzolo 1, 35131, Padova, Italy

    A. Zoleo, F. Vecchia & M. Brustolon

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  1. A. Zoleo
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  2. F. Vecchia
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  3. M. Brustolon
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Correspondence to M. Brustolon.

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Zoleo, A., Vecchia, F. & Brustolon, M. Characterization of ancient and modern papers by CW-EPR spectroscopy. Appl Magn Reson 35, 213–220 (2009). https://doi.org/10.1007/s00723-008-0155-z

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  • DOI: https://doi.org/10.1007/s00723-008-0155-z

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