Implementing a new EPR lineshape parameter for organic radicals in carbonaceous matter

Source Code for Biology and Medicine

Didier Gourier¹  Laurent Binet¹  Yann Le Du¹  Mathilde Bourbin² 

[1] Laboratoire de Chimie de la Matière Condensée de Paris, Ecole Nationale Supérieure de Chimie de Paris, UMR CNRS 7574, Paris, France;Biogéochimie et Ecologie des Milieux Continentaux, UMR CNRS 7618, Université Pierre et Marie Curie, Paris, France

关键词: Python;    Literate programming;    Exobiology;    Carbonaceous matter;    Solid state chemistry;    Lineshape;    Electron paramagnetic resonance;   

Others  :  805252
DOI  :  10.1186/1751-0473-8-15

 received in 2012-06-13, accepted in 2013-06-18,  发布年份 2013

【 摘 要 】

Background

Electron Paramagnetic Resonance (EPR) is a non-destructive, non-invasive technique useful for the characterization of organic moieties in primitive carbonaceous matter related to the origin of life. The classical EPR parameters are the peak-to-peak amplitude, the linewidth and the g factor; however, such parameters turn out not to suffice to fully determine a single EPR line.

Results

In this paper, we give the definition and practical implementation of a new EPR parameter based on the signal shape that we call the R₁₀ factor. This parameter was originally defined in the case of a single symmetric EPR line and used as a new datation method for organic matter in the field of exobiology.

Conclusion

Combined to classical EPR parameters, the proposed shape parameter provides a full description of an EPR spectrum and opens the way to novel applications like datation. Such a parameter is a powerful tool for future EPR studies, not only of carbonaceous matter, but also of any substance which spectrum exhibits a single symmetric line.

Reproducibility

The paper is a literate program—written using Noweb within the Org-mode as provided by the Emacs editor— and it also describes the full data analysis pipeline that computes the R₁₀ on a real EPR spectrum.

【 授权许可】

   
2013 Bourbin et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

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