Raman spectroscopy of irradiated organic matter

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doi: 10.1016/j.gca.2007.03.001
Authors:Court, Richard W.; Sephton, Mark A.; Parnell, John; Gilmour, Iain
Author Affiliations:Primary:
Open University, Planetary and Space Sciences Research Institute, London, United Kingdom
Other:
Imperial College London, United Kingdom
University of Aberdeen, United Kingdom
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 71(10), p.2547-2568. Publisher: Elsevier, New York, NY, International. ISSN: 0016-7037
Publication Date:2007
Note:In English. 41 refs.; illus., incl. 6 tables
Summary:Raman spectroscopy of a range of irradiated and nonirradiated natural terrestrial bitumens has revealed that radiolytic alteration is generally associated with an increase in structural disorganisation. An interpretational methodology designed to overcome the considerable difficulties in obtaining reproducible, meaningful parameters of structural disorganisation is also presented, and should prove useful for future Raman applications. Raman investigation of a set of bitumens reported to have formed by the radiolytic polymerisation of light hydrocarbons, such as methane, has revealed excessive structural disorganisation, relative to biogenic complex-hydrocarbon-derived bitumens of similar radioelement concentrations, which may indicate the importance of precursor materials on the organic products of irradiation. Variations in the R1 ratio (D1/G band intensity) are found to be the best guide to variations in structural organisation. Comparisons of Raman spectra of the same sample, but produced by different exciting wavelengths, reveal the importance of the selection of a suitable laser wavelength. The results are discussed in terms of analyses of irradiated organic matter in the solar system, especially cometary nuclei and carbonaceous chondrites. Abstract Copyright (2007) Elsevier, B.V.
Sections:Geochemistry
Subsections:Organic geochemistry
Subjects:Alkylbenzenes; Alteration; Aromatic hydrocarbons; Biochemistry; Bitumens; Carbonaceous chondrites; Chemical composition; Chemical ratios; Chondrites; Cretaceous; Devonian; Geochemistry; Hydrocarbons; Irradiation; Mesozoic; Meteorites; Molecular structure; Old Red Sandstone; Organic compounds; Paleozoic; Raman spectra; Samples; Solar system; Spectra; Stony meteorites; Upper Cretaceous; Veins; Argentina; Australasia; Australia; Canada; Europe; Great Britain; Mendoza Argentina; Neuquen Basin; Powys Wales; Saskatchewan; Scotland; South America; United Kingdom; Wales; Western Canada; Western Europe; Diamante Formation; Dingwall Scotland; Huemul Mine; Nash Scar Limestone
Coordinates:N514500 N525200 W0025600 W0035500
Abstract Numbers:07M/2159
Record ID:2008009452
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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