Frost Ray L, Wills Rachael-Anne, Martens Wayde, Weier Matt
Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, G.P.O. Box 2434, Brisbane, Qld. 4001, Australia.
Spectrochim Acta A Mol Biomol Spectrosc. 2005 Dec;62(4-5):869-74. doi: 10.1016/j.saa.2005.03.018.
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 6300-7000 cm-1 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 6143 cm-1, attributed to the first fundamental overtones of NH stretching vibrations. A set of bands are observed in the 4700-5500 cm-1 region which are assigned to combination bands of the hydroxyl stretching and deformation vibrations. The ammonium-jarosite shows additional bands at 4730 and 4621 cm-1, 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.
近红外（NIR）光谱已被用于分析一系列通式为Mn(Fe3+)6(SO4)4(OH)12的合成黄钾铁矾，其中M为K、Na、Ag、Pb、NH4+和H3O+。虽然黄钾铁矾的光谱呈现出共同模式，但仍观察到光谱差异，这使得这些矿物能够被区分。6300 - 7000 cm-1区域的近红外波段归因于红外和拉曼羟基伸缩振动的第一泛频。铵黄钾铁矾的近红外光谱在6460和6143 cm-1处显示出额外的波段，归因于NH伸缩振动的第一泛频。在4700 - 5500 cm-1区域观察到一组波段，它们被指定为羟基伸缩振动和变形振动的组合波段。铵黄钾铁矾在4730和4621 cm-1处显示出额外的波段，归因于NH伸缩振动和弯曲振动的组合。即使矿物的化学式密切相关，近红外光谱也有能力区分黄钾铁矾矿物。近红外光谱技术作为一种行星特别是火星上的矿物勘探工具具有巨大潜力。
