EPR of Radicals in Primitive Organic Matter: ...
Type de document :
Article dans une revue scientifique
URL permanente :
Titre :
EPR of Radicals in Primitive Organic Matter: A Tool for the Search of Biosignatures of the Most Ancient Traces of Life
Auteur(s) :
Skrzypczak-Bonduelle, Audrey [Auteur]
Laboratoire de Chimie de la Matière Condensée de Paris (site Paris VI) [LCMCP (site Paris VI)]
Binet, Laurent [Auteur]
Laboratoire de Chimie de la Matière Condensée de Paris (site ENSCP) [LCMCP (site ENSCP)]
Delpoux, O. [Auteur]
Laboratoire de Chimie de la Matière Condensée de Paris (site ENSCP) [LCMCP (site ENSCP)]
Vezin, Herve [Auteur]
Laboratoire de Chimie Organique et Macromoleculaire [UMR CNRS 8009]
Derenne, Sylvie [Auteur]
Biogéochimie et écologie des milieux continentaux [Bioemco]
Robert, F. [Auteur]
Laboratoire d'Etude de la Matière Extraterrestre / UMS Nano-analyses [LEME / UNA]
Gourier, Didier [Auteur]
23913|||Laboratoire de Chimie de la Matière Condensée de Paris (site ENSCP) [LCMCP (site ENSCP)]
Laboratoire de Chimie de la Matière Condensée de Paris (site Paris VI) [LCMCP (site Paris VI)]
Binet, Laurent [Auteur]
Laboratoire de Chimie de la Matière Condensée de Paris (site ENSCP) [LCMCP (site ENSCP)]
Delpoux, O. [Auteur]
Laboratoire de Chimie de la Matière Condensée de Paris (site ENSCP) [LCMCP (site ENSCP)]
Vezin, Herve [Auteur]
Laboratoire de Chimie Organique et Macromoleculaire [UMR CNRS 8009]
Derenne, Sylvie [Auteur]
Biogéochimie et écologie des milieux continentaux [Bioemco]
Robert, F. [Auteur]
Laboratoire d'Etude de la Matière Extraterrestre / UMS Nano-analyses [LEME / UNA]
Gourier, Didier [Auteur]
23913|||Laboratoire de Chimie de la Matière Condensée de Paris (site ENSCP) [LCMCP (site ENSCP)]
Titre de la revue :
Applied Magnetic Resonance
Nom court de la revue :
Appl Magn Reson
Numéro :
33
Pagination :
371-397
Éditeur :
Springer Science and Business Media LLC
Date de publication :
2008-05
ISSN :
1613-7507
Discipline(s) HAL :
Chimie/Chimie organique
Résumé en anglais : [en]
In this paper we report on electron paramagnetic resonance (EPR) of paramagnetic centers in the carbonaceous matter of primitive siliceous rocks, known to contain the most ancient traces of life. The EPR lines observed are ...
Lire la suite >In this paper we report on electron paramagnetic resonance (EPR) of paramagnetic centers in the carbonaceous matter of primitive siliceous rocks, known to contain the most ancient traces of life. The EPR lines observed are attributed to π-radicals stabilized by the aromatic structure of this matter. It is found that the line widths and the line shapes vary continuously during geological periods and show a progressive pattern evolution from Gaussian–Lorentzian (recent) to purely Lorentzian (ca. 2000 million years [Myr]), and to supra-Lorentzian (ca. 3500 Myr). Artificial ageing experiments allowed us to define four stages of maturation of the organic matter according to the evolution of g-factors, EPR intensity, peak-to-peak line width and line shape. We suggest that the peculiar supra-Lorentzian line shape observed for organic matter older than 2000 Myr should be related to a low-dimensional (two- or one-dimensional) spatial distribution of electron spins. From these results, we derive a relationship between the line shape and the age of the organic matter, valid for ages ranging from about 600 Myr to about 3500 Myr.Lire moins >
Lire la suite >In this paper we report on electron paramagnetic resonance (EPR) of paramagnetic centers in the carbonaceous matter of primitive siliceous rocks, known to contain the most ancient traces of life. The EPR lines observed are attributed to π-radicals stabilized by the aromatic structure of this matter. It is found that the line widths and the line shapes vary continuously during geological periods and show a progressive pattern evolution from Gaussian–Lorentzian (recent) to purely Lorentzian (ca. 2000 million years [Myr]), and to supra-Lorentzian (ca. 3500 Myr). Artificial ageing experiments allowed us to define four stages of maturation of the organic matter according to the evolution of g-factors, EPR intensity, peak-to-peak line width and line shape. We suggest that the peculiar supra-Lorentzian line shape observed for organic matter older than 2000 Myr should be related to a low-dimensional (two- or one-dimensional) spatial distribution of electron spins. From these results, we derive a relationship between the line shape and the age of the organic matter, valid for ages ranging from about 600 Myr to about 3500 Myr.Lire moins >
Langue :
Anglais
Comité de lecture :
Oui
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
Université de Lille
CNRS
CNRS
Collections :
Date de dépôt :
2021-06-18T08:54:05Z
2021-10-11T14:31:52Z
2021-10-11T14:31:52Z