title: Implementing a new EPR lineshape parameter for organic radicals in carbonaceous matter.
abstract: 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.
  
  
  CONCLUSIONS
  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.
  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.
authors.affiliation: Laboratoire de Chimie de la Matière Condensée de Paris, Ecole Nationale Supérieure de Chimie de Paris, UMR CNRS 7574, Paris, France. yann-ledu@chimie-paristech.fr.
authors.forename: Mathilde
authors.initials: M
authors.lastname: Bourbin
authors.forename: Yann Le
authors.initials: YL
authors.lastname: Du
authors.forename: Laurent
authors.initials: L
authors.lastname: Binet
authors.forename: Didier
authors.initials: D
authors.lastname: Gourier