Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9756927 | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2005 | 6 Pages |
Abstract
Near-infrared (NIR) spectroscopy has been used to analyse a suite of synthesised jarosites of formula Mn(Fe3+)6(SO4)4(OH)12 where M is K, Na, Ag, Pb, NH4+ and H3O+. Whilst the spectra of the jarosites show a common pattern, differences in the spectra are observed which enable the minerals to be distinguished. The NIR bands in the 6300-7000Â cmâ1 region are attributed to the first fundamental overtone of the infrared and Raman hydroxyl stretching vibrations. The NIR spectrum of the ammonium-jarosite shows additional bands at 6460 and 6143Â cmâ1, attributed to the first fundamental overtones of NH stretching vibrations. A set of bands are observed in the 4700-5500Â cmâ1 region which are assigned to combination bands of the hydroxyl stretching and deformation vibrations. The ammonium-jarosite shows additional bands at 4730 and 4621Â cmâ1, attributed to the combination of NH stretching and bending vibrations. NIR spectroscopy has the ability to distinguish between the jarosite minerals even when the formula of the minerals is closely related. The NIR spectroscopic technique has great potential as a mineral exploratory tool on planets and in particular Mars.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Ray L. Frost, Rachael-Anne Wills, Wayde Martens, Matt Weier,