LABORATORY DISPERSIVE EXAFS SPECTROMETER

We report on a laboratory EXAFS spectrometer optimized for transmissio n dispersive mode. Absorption edges ranging from 6 to 20 keV can be st udied. Factors determining energy range and resolution are detailed. A new asymmetric geometry which allows to use all the lattice planes of the dispersing crystal is described and the choice of the best plane analysed. EXAFS spectra of Cu metal and Cu acetate, obtained on this l aboratory facility, are compared to the corresponding spectra recorded on the French synchrotron facility (LURE).