TY - JOUR
T1 - He+ ion implantation and electron irradiation effects on cathodoluminescence of plagioclase
AU - Kayama, Masahiro
AU - Nishido, Hirotsugu
AU - Toyoda, Shin
AU - Komuro, Kosei
AU - Finch, Adrian A.
AU - Lee, Martin R.
AU - Ninagawa, Kiyotaka
N1 - Funding Information:
We are deeply indebted to Dr. S. Nakano (Shiga University, Shiga, Japan) for helpful suggestions on CL of feldspar. We thank Dr. Y. Shibata (Technical center, Hiroshima University, Hiroshima, Japan) for technical support on WDS using EPMA. The measurement of EPMA was made using JXA-8200 at the Natural Science Center for Basic Research and Development (N-BARD), Hiroshima University. He ion implantation experiments were supported by the Inter-University Program for the Joint Use of the Japan Atomic Energy Agency (Takasaki), Grant No. 12010 to H. N. +
PY - 2013/7
Y1 - 2013/7
N2 - Cathodoluminescence (CL) spectra of unirradiated, He+ ion-implanted and electron-irradiated plagioclase minerals contain the following emission bands: (1) below 300 nm due to Pb2+, (2) at ~320 and ~350 nm to Ce3+, (3) at 380-420 nm to Eu2+, Ti4+ and/or Al-O--Al/Ti defects, (4) at 560-580 nm to Mn2+ and (5) at 720-760 nm to Fe3+. During the implantation of He+ 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+ atoms. As its intensity increases with radiation dose, this emission component has potential for geodosimetry and geochronometry. Electron irradiation causes Na+ 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+ ion-implanted albite and oligoclase, but negatively for the implanted albite above 1.07 × 10-4 C/cm2. 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.
AB - Cathodoluminescence (CL) spectra of unirradiated, He+ ion-implanted and electron-irradiated plagioclase minerals contain the following emission bands: (1) below 300 nm due to Pb2+, (2) at ~320 and ~350 nm to Ce3+, (3) at 380-420 nm to Eu2+, Ti4+ and/or Al-O--Al/Ti defects, (4) at 560-580 nm to Mn2+ and (5) at 720-760 nm to Fe3+. During the implantation of He+ 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+ atoms. As its intensity increases with radiation dose, this emission component has potential for geodosimetry and geochronometry. Electron irradiation causes Na+ 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+ ion-implanted albite and oligoclase, but negatively for the implanted albite above 1.07 × 10-4 C/cm2. 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.
KW - Cathodoluminescence
KW - Electron irradiation
KW - He ion implantation
KW - Plagioclase
KW - Radiation-induced defect center
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U2 - 10.1007/s00269-013-0590-8
DO - 10.1007/s00269-013-0590-8
M3 - Article
AN - SCOPUS:84879242013
VL - 40
SP - 531
EP - 545
JO - Physics and Chemistry of Minerals
JF - Physics and Chemistry of Minerals
SN - 0342-1791
IS - 7
ER -