Samples of quartz were implanted with Hg+ and Br+, and their mobilities were monitored by means of the Rutherford back-scattering spectrometry of 2.1MeV He2+ ions. The results showed that both Hg+ and Br+ were still immobile at room temperature; even after more than 61000h. The depth distributions of Hg+ agreed well with predicted values. However, in the case of Br+ the mean projected range was shorter than predicted. It was found that 300keV Hg+ and 250keV Br+ were mobile after annealing at 600 and 500C, respectively.

K.M.Wang, B.R.Shi, H.Y.Zhai, S.J.Ma, X.D.Liu, J.T.Liu, X.J.Liu: Australian Journal of Physics, 1996, 49[3], 705-11