Polarization of the x-ray-induced blue luminescence in quartz

Abstract

The polarization of the x-ray-induced blue luminescence from synthetic quartz has been measured between 80 and 225 K. Two overlapping bands having different polarizations are observed; one peaks at 2.48 eV and is almost completely polarized perpendicular to the $c$ axis, while the other peaks at 2.74 eV and is polarized parallel to the $c$ axis with $\frac{(I_{\parallel }-I_{\perp })}{(I_{\parallel }+I_{\perp })}=0.48\mathrm{}\pm 0.02$. This latter band corresponds to emission from a triplet state of the luminescence center. These results are discussed in terms of a previously proposed model.