Quartz CL spectrum, 20 keV e<sup>-</sup> beam, Torpy <i>et al.</i> 2020

Quartz CL spectrum, 20 keV e^- beam, Torpy et al. 2020

Description	CL spectrum of Quartz from the Tista River, Bangladesh
Reference	Torpy et al. 2020 Torpy, A., Wilson, N., MacRae, C., Pownceby, M., Biswas, P., Rahman, M., & Zaman, M. (2020). Deciphering the Complex Mineralogy of River Sand Deposits through Clustering and Quantification of Hyperspectral X-Ray Maps. Microscopy and Microanalysis, 26(4), 768-792 https://doi.org/10.1017/S143192762000135X
Date measured	2018-04-14
Material	Quartz [ SiO₂ ] Rutilated quartz specimen, from Ibitiara, Bahia, Northeast Region, Brazil. Size: 6.6 x 5.5 x 5.1 cm. © Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
Specimen	Tista 2020 D4 Shaker [CSIRO], Teesta River, Bangladesh Clustered phase map of river sands (D4 shaker), from the Tista River, Bangladesh. From Torpy et al. 2020 © (C) 2020 CSIRO Mineral Resources
Specimen temperature	Ambient
Technique	Cathodoluminescence (CL)
Instrument	JEOL 8500F
Probe	20 keV electron beam
Beam current	69.64 nA
Probe diameter	2 μm
Detector name	OceanOptics QEPRO
Det. technology	CCD, Si, Peltier cooled
Acquisition time	6925.5 s
Channel count	1024
Wavelength range	199.467 … 970.586 nm
Intensity range	-1.21021 … 74.9324 counts
Integral	19037.7 counts
Related measurement	Quartz EDS spectrum, 20 keV e^- beam, Torpy et al. 2020 (co-measured)
Lines	NBOHC 1.94 eV (100%), Ti⁴⁺ 2.77 eV (28%)

Nominal composition of Quartz [ SiO₂ ].
Element	Atoms	At%	Wt%
Si	1	33.3	46.7
O	2	66.7	53.3

CL spectrum of Quartz from the Tista River, Bangladesh