Pb+ irradiation of synthetic zircon (ZrSiO4): Infrared spectroscopic investigation--Reply

Zhang, M. and Ewing, R. C. and Boatner, L. A. and Salje, E. K. H. and Weber, W. J. and Daniel, P. and Zhang, Y. and Farnan, I. (2009) Pb+ irradiation of synthetic zircon (ZrSiO4): Infrared spectroscopic investigation--Reply. American Mineralogist, 94 (5-6). pp. 856-858. DOI https://doi.org/10.2138/am.2009.542

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We appreciate the opportunity to respond to the discussion by Nasdala (2009) concerning our interpretation of infrared spectra used to investigate the change in the structure of Pb-irradiated zircon as a function of increasing flux (Zhang et al. 2008a, 2008b). Nasdala is correct in cautioning experimentalists to carefully match the analytical technique to the expected irradiation damage profile to optimally probe the irradiation effects, and in fact, this point was emphasized by Ewing et al. (2003) in a review of radiation effects in zircon. However, Nasdala’s discussion fails to fully appreciate three important points. (1) There is a difference between in situ irradiations of TEM samples that must be electron transparent, ~200 nm thick, as were completed by Weber et al. (1994), and more bulk-like irradiations that were completed in the Zhang et al. (2008a, 2008b) studies. (2) The particle-solid interactions change along the path of an implanted ion, that is the distribution and nature of the damage changes with depth as the ion loses energy, resulting in the greatest number of ballistic interactions near the end of the particle trajectory (see Fig. 1 of Ewing et al. 2003). (3) In comparing natural zircon damaged by alpha-decay events with ion-irradiated zircon, one must be aware that the recoil nucleus and the alpha particle cause different types of damage, and the use of the Pb-implantation experiment is meant to simulate only the alpha-recoil damage.

Item Type: Article
Uncontrolled Keywords: 08AREP; IA58
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: American Mineralogist
Volume: 94
Page Range: pp. 856-858
Identification Number: https://doi.org/10.2138/am.2009.542
Depositing User: Sarah Humbert
Date Deposited: 11 Jul 2009 13:28
Last Modified: 23 Jul 2013 09:55
URI: http://eprints.esc.cam.ac.uk/id/eprint/1092

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