He+ ion implantation and electron irradiation effects on cathodoluminescence of plagioclase

Kayama, M., Nishido, H., Toyoda, S., Komuro, K., Finch, A.A., Lee, M. and Ninagawa, K. (2013) He+ ion implantation and electron irradiation effects on cathodoluminescence of plagioclase. Physics and Chemistry of Minerals, 40(7), pp. 531-545. (doi: 10.1007/s00269-013-0590-8)

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Publisher's URL: http://link.springer.com/article/10.1007%2Fs00269-013-0590-8

Abstract

Cathodoluminescence (CL) spectra of unirradiated, He<sup>+</sup> ion-implanted and electron-irradiated plagioclase minerals contain the following emission bands: (1) below 300 nm due to Pb<sup>2+</sup>, (2) at ~320 and ~350 nm to Ce<sup>3+</sup>, (3) at 380–420 nm to Eu<sup>2+</sup>, Ti<sup>4+</sup> and/or Al–O<sup>−</sup>–Al/Ti defects, (4) at 560–580 nm to Mn<sup>2+</sup> and (5) at 720–760 nm to Fe<sup>3+</sup>. During the implantation of He<sup>+</sup> ion, much of their energy may be dissipated by partial destruction and strain of the feldspar framework, resulting in quenching of CL. Deconvolution of CL spectra acquired from albite and oligoclase reveals an emission component at 1.86 eV (666 nm) assigned to a radiation-induced defect center associated with Na<sup>+</sup> atoms. As its intensity increases with radiation dose, this emission component has potential for geodosimetry and geochronometry. Electron irradiation causes Na<sup>+</sup> migration in plagioclase, and then a considerable reduction in intensity of emissions assigned to impurity centers, which is responsible for an alteration in the energy state or a decrease in luminescence efficiency following the change of activation energy. Emission intensity at 1.86 eV positively correlates with electron irradiation time for unimplanted and He<sup>+</sup> ion-implanted albite and oligoclase, but negatively for the implanted albite above 1.07 × 10<sup>−4</sup> C/cm<sup>2</sup>. It implies that radiation halo produced by α-particles should not be measured using CL spectroscopy to estimate β radiation dose on albite in the high radiation level.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Lee, Professor Martin
Authors: Kayama, M., Nishido, H., Toyoda, S., Komuro, K., Finch, A.A., Lee, M., and Ninagawa, K.
Subjects:Q Science > QE Geology
College/School:College of Science and Engineering > School of Geographical and Earth Sciences > Earth Sciences
Research Group:Earth Systems
Journal Name:Physics and Chemistry of Minerals
Publisher:Springer
ISSN:0342-1791
ISSN (Online):1432-2021

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