Tikhonov-Miller regularization with a denoisy and deconvolved signal as model of solution for improvement of depth resolution in SIMS analysis

In this paper the improvement by deconvolution of the depth resolution in Secondary Ion Masse Spectrometry (SIMS) analysis is studied. Indeed, a new Tikhonov-Miller deconvolution method, where a priori model of solution is included. The latter is a denoisy and pre-deconvolved signal obtained firstly by the application of wavelet shrinkage algorithm and after, by the introduction of the obtained denoisy signal in an iterative deconvolution algorithm. The results of the proposed algorithm are compared to those of Tikhonov-Miller regularization where the model of solution is a raw signal. Finally, based on the obtained results the advantages and limitations of the proposed method as well as suggestions for future work are presented and discussed.Anglai

Chevrel Phases: Genesis and Developments

International audienceThis chapter summarizes the important role played by Marcel Sergent in the discovery in the Rennes Laboratory of the Chevrel Phases, which stimulated considerable interest in the international solid-state chemistry community, because of their remarkable superconducting properties. After a brief general introduction to this topic, the seminal discoveries associated with these phases between 1970 and 1990 are described. After that their initial synthesis and structural determination was discovered, it was necessary to establish their critical superconducting transition temperature, the critical magnetic field, and the critical current density in wires, single crystals, and thin films. More recently their applications as battery materials, in catalysis, and their thermoelectric properties have been studied and are briefly described. These phases opened up the way not only to a rich solid-state chemistry but also to a rich solution chemistry, which complemented the classical field of transition metal carbonyl clusters. The basic cluster units of the Chevrel Phases continue to be studied in the Rennes Laboratory by the heirs of Marcel Sergent and more widely in the international community