Using Classical Dispersion Analysis to Extract Peak Parameters, Optical Constants from IR Lab Absorbance Spectra: Olivine

Details Using Classical Dispersion Analysis to Extract Peak Parameters, Optical Constants from IR Lab Absorbance Spectra: Olivine Using Classical Dispersion Analysis to Extract Peak Parameters, Optical Constants from IR Lab Absorbance Spectra: Olivine

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21440207p&link_type=abstract

American Astronomical Society, AAS Meeting #214, #402.07; Bulletin of the American Astronomical Society, Vol. 41, p.663

Astronomy and Astrophysics

Astronomy

Scientific paper

Laboratory measurements quantifying the effect of Fe substituting for Mg in olivine are needed to distinguish compositional from temperature effects in observational data. Because most olivine samples are too small to acquire reflectivity data used to obtain the optical functions n(λ) and k(λ) needed for radiative transfer models, we apply the principle that classical dispersion theory may be used to determine peak positions, widths, strengths, and n and k estimates from absorption spectra of thin film samples. We study room temperature absorption spectra of a large suite of olivines evenly spaced across Mg and Fe compositions, and isotropic and anisotropic minerals with varying hardness and numbers of spectral bands. For olivine, adding accounting for asymmetric peak shapes does not substantially alter estimates of peak position but increases the error on FWHM and oscillator strengths. Values from classical dispersion fits match published n and k derived from reflectivity (better agreement in k) when the dust proxy is soft and the thickness of the sample is independently constrained. Electronic data and peak parameter trends for the laboratory olivine absorption spectra and the viability of the extracted n and k are discussed with regard to astronomy.

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