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

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

Description	CL spectrum of Titanite 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	Titanite [ CaTiSiO₅ ] Titanite on amphibole, from Wannenköpfe, Ochtendung, Eifel region, Germany. Image width: 2mm © 2010 Fred Kruijen (via Wikimedia Commons), 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	522.9 s
Channel count	1024
Energy range	1.27642 … 6.21094 eV
Intensity range	100 (normalised intensity)
Related measurement	Titanite EDS spectrum, 20 keV e^- beam, Torpy et al. 2020 (co-measured)
Lines	Nd³⁺ 1.329 eV (37.1%), 1.452 eV (16.2%), 1.424 eV (18%), 1.344 eV (30.9%), 1.371 eV (43%), 1.384 eV (93.2%), 1.41 eV (37%), Sm³⁺ 2.069 eV (34.8%), Ti-O band 2.264 eV (100%)

Nominal composition of Titanite [ CaTiSiO₅ ].
Element	Atoms	At%	Wt%
Ca	1	12.5	20.4
Ti	1	12.5	24.4
Si	1	12.5	14.3
O	5	62.5	40.8

CL spectrum of Titanite from the Tista River, Bangladesh