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Understanding the Reasons for Variations in Luminescence Sensitivity of Natural Quartz Using Spectroscopic and Chemical Studies

Suchinder Sharma (Institutionen för fysik, Kondenserade materiens fysik (Chalmers)) ; Santa Chawla ; M. D. Sastry ; Mahesh Gaonkar ; Sandesh Mane ; V. Balaram ; Ashok K. Singhvi
PROCEEDINGS OF THE INDIAN NATIONAL SCIENCE ACADEMY (0370-0046). Vol. 83 (2017), 3, p. 645-653.
[Artikel, refereegranskad vetenskaplig]

Natural quartz from diverse provenances exhibit variations in their luminescence sensitivity (photon flux/mg.Gy) that span over ten orders of magnitude. A range of factors (such as crystallization/recrystallization process, irradiation, thermal and optical history) that modify luminescence sensitivity have been considered to explain such differences in luminescence sensitivity. However, a clearly definable/identifiable reason is still awaited; such as, these large variations in luminescence sensitivity are related to commonly occurring luminescence quenchers/enhancers in natural quartz lattice. Towards this, quartz mineral grains extracts from different provenances and from varied depositional environments were examined spectroscopically using Fourier Transform infra-red spectroscopy (FTIR), optically stimulated luminescence (OSL), photoluminescence (PL), time resolved PL (TRPL) decay, thermoluminescence (TL) and the trace element analysis. The present study exhibited an anti-correlation between OSL sensitivity and water content in quartz (estimated through integrated intensity of normalized FTIR signal in the wave number region 3000-3600 cm(-1)), such that a sensitivity change of over 5 orders of magnitude corresponded to a change in integrated water absorption signal by 5 times, but in opposite direction. PL and TRPL results enabled further insights.

Nyckelord: crystalline quartz, age-dependence, temperatures, defects, osl

Denna post skapades 2017-10-20.
CPL Pubid: 252670


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Institutionen för fysik, Kondenserade materiens fysik (Chalmers)



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