Tourmaline luminescence

Under lamp excitation tourmaline is practically non-luminescent, while under X-ray excitation it exhibits impurity luminescence from Fe centered at 700-750nm and Mn + centered at 560-570nm (Kusnetsov and Tarashchan 1988). The natural tourmaline in our study consisted of four samples. The laser-induced time-resolved technique enables us to detect Cr + emission centers (Fig. 4.58). 

Fig. 4.58. a-f Laser-induced time-resolved luminescence spectra of tourmaline demonstrating Cr ", and Fe " centers... 

Under lamps excitation tourmaline is practically non-luminescent, while under X-ray excitation it exhibits impurity luminescence from Fe " centered at... 

Fig. 4.134 (a-f) Laser-induced time-resolved luminescence spectra tourmaline demonstrating... 

Fig. 4.136 (a-b) Laser-induced cw luminescence spectra of tourmaline under 532 nm excitation (http // rruff.info)... 

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