The Open UniversitySkip to content
 

Raman spectroscopy of irradiated organic matter

Court, Richard; Sephton, Mark; Parnell, J. and Gilmour, Iain (2007). Raman spectroscopy of irradiated organic matter. Geochimica et Cosmochimica Acta, 71(10) pp. 2547–2568.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1016/j.gca.2007.03.001
Google Scholar: Look up in Google Scholar

Abstract

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.

Item Type: Journal Article
ISSN: 0016-7037
Keywords: Raman sepctroscopy; irradiation; organic matter; bitumens
Academic Unit/Department: Science > Physical Sciences
Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 7462
Depositing User: Iain Gilmour
Date Deposited: 03 May 2007
Last Modified: 02 Dec 2010 19:59
URI: http://oro.open.ac.uk/id/eprint/7462
Share this page:

Altmetrics

Scopus Citations

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk