Trace Determination and Pressure Estimation of Fluorine F2 Caused by Irradiation Damage in Minerals and Synthetic Fluorides

Irradiated alkali and earth alkali halides can form metal colloids and halogen molecules, which stay trapped inside the crystal. In this paper we provide 19F NMR spectroscopic evidence of trapped F2 fluids in heavy ion‐bombarded synthesized LiF crystals as well as in a variety of the mineral Villiau...

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Bibliographic Details
Published in:Chemistry : a European journal 2016-12, Vol.22 (51), p.18388-18393
Main Authors: Celinski, Vinicius R., Ditter, Michael, Kraus, Florian, Fujara, Franz, Schmedt auf der Günne, Jörn
Format: Article
Language:English
Subjects:
Chemistry
double-quantum excitation
Fluorides
fluorine
NMR spectroscopy
radiation damage
relaxation
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Summary:Irradiated alkali and earth alkali halides can form metal colloids and halogen molecules, which stay trapped inside the crystal. In this paper we provide 19F NMR spectroscopic evidence of trapped F2 fluids in heavy ion‐bombarded synthesized LiF crystals as well as in a variety of the mineral Villiaumite (NaF). This is the 2nd mineral in which F2 is unambiguously detected in nature. The trace quantification of the latter is in the order of magnitude of 10−6 mol g−1. Pressures and densities of the F2 fluids are estimated based on the theory of nuclear spin relaxation in dilute gases. Enviromental chemistry: A trace quantification of elemental F2 is provided in the mineral villaumite NaF. This is the second mineral, in which F2 is unambiguously detected in nature (see figure).
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201603402