APL'2002 Madrid Proceedings APL, a powerful research tool in Magnetic Resonance Spectroscopy Claude Chachaty e-mail : claude.chachaty@wanadoo.fr Keywords : NMR, ESR, spin, hyperfine coupling, spectra, simulations, automated fitting. I-Introduction In spite of its outstanding scientific potential, APL is up to now ignored or scarcely exploited by research workers. During 15 years as the head of the Magnetic Resonance Laboratory of the Nuclear Research Center at Saclay, the author has extensively used APL in his works [1-3] and continues to promote its scientific applications. The Magnetic Resonance Spectroscopy (MRS) includes two main branches, the Nuclear Magnetic Resonance (NMR) and the Electron Spin Resonance (ESR) also called Electron Paramagnetic Resonance (EPR). The NMR is a priviledged method for the identification and conformational analysis of organic and biological molecules and is well known for its medical application, the Magnetic Resonance Imaging. The ESR/EPR which is the main subject of this topics, is the specific method for studying paramagnetic molecules i.e. molecules possessing at least one unpaired electron, namely the free radicals resulting from the breaking of a chemical bond, triplet fundamental (e.g. the oxygen of air) or lowest excited states and some metal coordination complexes. Most of these species are very
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