Spectral Properties of Anhydrous Carbonates and Nitrates

Abstract

 Spectral bands are presented for remote detection of anhydrous carbonates and nitrates. Mid-IR band center comparisons for the v3 vibration compared to the v2 and v4 vibrations enable identification of carbonate chemistry. NIR band center comparisons for ~2.3 vs 2.5 µm, ~2.3 vs 4 µm, and ~3.4 vs 4 µm best enable identification of carbonate chemistry.

How the surface chemical properties of nanoceria are related to its enzyme-like, antiviral and degradation activity

“…Both samples also show peak at 1041 cm −1 (and peak at 735 cm −1 only visible in Ce_PER) assigned to the residual NO 3 − from the synthesis. 40 The peak at ca. 595 cm −1 visible in all samples was attributed to Frenkel-type oxygen defects.…”

Insight into CO selective chemisorption from syngas mixtures through Li2MnO3; a new H2enrichment material

“…55 On the other hand, the bands located at 2500 and 2930 cm −1 could be related to overtone and combination bands of carbonates. 56 In this sense, the band located at 2900 cm −1 is observed in all the temperature range, and its intensity correlates with the carbonate band at 1438 cm −1 . Contrarily, the band at 2500 cm −1 appears only at high temperatures ( T ≥ 535 °C) regardless of the presence or formation of carbonates at lower temperatures.…”

Detection and Relative Quantification of Neodymium in Sillai Patti Carbonatite Using Decision Tree Classification of the Hyperspectral Data

“…Based on the carbonate minerals present, carbonatites are usually classed as calcite-carbonatite (sovite), dolomite-carbonatite (rauhaugite), and ankerite-carbonatite (beforsite). Seven carbonate bands are common to all anhydrous carbonate minerals [ 79 , 80 , 81 , 82 ]. Based on the presence of higher amounts of calcite observed in the thin section and the spectral profiles obtained both through the ASD spectroradiometer and the hyperspectral cameras, the Sillai Patti carbonatite samples are calcite-carbonatite sovite.…”