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Published December 15, 2007 | public
Journal Article

Mid-infrared (5–100 μm) reflectance spectra and optical constants of ten phyllosilicate minerals

Abstract

We have derived the real and imaginary indices of refraction for 10 phyllosilicate minerals—montmorillonite, beidellite, nontronite, hectorite, saponite, illite, illite–smectite (60/40 interlayered) kaolinite, halloysite, and serpentine—from 100–2000 cm^(−1) (5–100 μm) at 2 cm^(−1) spectral sampling using classical Lorentz–Lorenz dispersion theory. We present the real and imaginary indices and the oscillator parameters with which they were modeled. Use of these optical constants will aid in the modeling of thermal infrared spectra of planets, asteroids, interplanetary and interstellar dust, and protoplanetary disks around nearby stars.

Additional Information

© 2007 Elsevier Inc. Received 19 March 2007; revised 18 June 2007; Available online 15 August 2007. We thank J. Michalski for loaning well characterized phyllosilicate samples for our reflectance measurements. We also thank Ted Roush and Ed Cloutis for thorough reviews that improved the manuscript. This work was supported by the NASA Mars Fundamental Research Program.

Additional details

Created:
August 22, 2023
Modified:
October 20, 2023