K. Lieb, S. Gasiorek, J. Keinonen, P. Sahoo, T. Sajavaara
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Alkali-ion irradiated alpha-quartz: low-temperature cathodoluminescence after chemical epitaxy
Even small fluences of implanted ions used for opto-doping alpha-quartz lead to amorphization of the matrix, but subsequent annealing in air or oxygen can restore its crystalline order (chemical epitaxy). Here we report on cathodoluminescence (CL) spectroscopy during chemical epitaxy of alpha-quartz irradiated with 50-keV Na-ions or 175-keV Rb ions and annealed in 18O2-gas. In particular, the variation of the CL spectra with the ion fluence will be discussed. The CL spectra at 10 K show an intense 2.90-2.95 eV blue band and differ greatly from the ones taken at 300 K. Finally we report on the observation of a spider-web surface structure after Rb implantation and annealing in lowpressure oxygen.
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