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Deconvolution of mineral absorption bands - An improved approachAlthough visible and near IR reflectance spectra contain absorption bands that are characteristic of the composition and structure of the absorbing species, deconvolving a complex spectrum is nontrivial. An improved approach to spectral deconvolution is presented that accurately represents absorption bands as discrete mathematical distributions and resolves composite absorption features into individual absorption bands. The frequently used Gaussian model of absorption bands is shown to be inappropriate for the Fe(2+) electronic transition absorptions in pyroxene spectra. A modified Gaussian model is derived using a power law relationship of energy to average bond length. The modified Gaussian model is shown to provide an objective and consistent tool for deconvolving individual absorption bands in the more complex orthopyroxene, clinopyroxene, pyroxene mixtures, and olivine spectra.
Document ID
19900048390
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sunshine, Jessica M.
(Brown Univ. Providence, RI, United States)
Pieters, Carle M.
(Brown Univ. Providence, RI, United States)
Pratt, Stephen F.
(Brown University Providence, RI, United States)
Date Acquired
August 14, 2013
Publication Date
May 10, 1990
Publication Information
Publication: Journal of Geophysical Research
Volume: 95
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
90A35445
Funding Number(s)
CONTRACT_GRANT: NAGW-28
CONTRACT_GRANT: NAGW-748
Distribution Limits
Public
Copyright
Other

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