Malíčková I., Bačík P., Fridrichová J., Hanus R., Štubňa J., Milovská S. & Škoda R., 2020: Detailed luminescence spectra interpretation of selected oxides: spinel from Myanmar and chrysoberyl – var. alexandrite from Tanzania. Acta Geologica Slovaca, 12, 1, 69–74.


Detailed luminescence spectra interpretation of selected oxides: spinel from Myanmar and chrysoberyl – var. alexandrite from Tanzania

Iveta Malíčková1, Peter Bačík1,2, Jana Fridrichová1, Radek Hanus3, Ján Štubňa4, Stanislava Milovská5 & Radek Škoda6

1Comenius University, Faculty of Natural Sciences, Department of Mineralogy and Petrology, Ilkovičova 6, 842 15 Bratislava, Slovakia, malickova3@uniba.sk, peter.bacik@uniba.sk, jana.fridrichova@uniba.sk
2Earth Science Institute of the Slovak Academy of Science, Dúbravska cesta 9, 840 05, Bratislava, Slovakia
3Gemological Laboratory of e–gems.cz, 110 00 Prague, Czech Republic; kakt@centrum.cz
4Gemmological Institute, Faculty of Natural Sciences, Constantine the Philosopher University in Nitra, Nábrežie mládeže 91, 949 74 Nitra, Slovakia; jstubna@ukf.sk
5Earth Science Institute of the Slovak Academy of Sciences, Ďumbierska 1, 974 01 Banská Bystrica, Slovakia; milovska@savbb.sk
6Masaryk University, Faculty of Science, Department of Geological Sciences, Kotlářská 2, 611 37 Brno, Czech Republic; rskoda@sci.muni.cz

Abstract

Different structure and symmetry of spinel and chrysoberyl influence their luminescence spectra Observed with Raman spectroscopy. Luminescence bands of spinel at 677, 685, 697, 710 a 718 nm were assigned to Cr3+. Luminescence duplet located at 685 and 687 nm belongs to R1 and R2–lines for the Cr3+ ion, the electron transition 2Eg → 4A2g, N1 and N4 at 687 and 700 nm; N3 (689 nm) is weak. Luminescence centers of alexandrite located at 644, 650, 653, 667, 669, 678, 680, 690, 694, 702, 707, and 716 nm were assigned to Cr3+. R–lines assigned to 679 with 677.3 nm, and 694.4 with 691.7 nm, accompanied by N–lines of Cr–Cr pairs. Luminescent duplet of alexandrite at 680 nm is associated with electron transition 2Eg → 4A2g. The R–lines in chrysoberyl are located at 678 nm (Rm–line) a 690 nm (Ri–line). Lower symmetry of the structure and Cr3+–bearing octahedra results in splitting, widening and overlapping of the luminescence bands in spectrum. Spinel with higher symmetry than chrysoberyl has the luminescence spectrum with smaller number of better resolved bands.


Key words: luminescence, Raman Spectroscopy, spin–forbidden transition, spinel, alexandrite


Manuskript doručený: 2020-04-30

Manuskript revidovaný: 2020-06-16


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