Charge, spin and momentum densities simultaneous refinement. From the method to the code

International audience; We present the latest progress of the Convergence of spin, charge and momentum Electron Density Analysis project. In the last decade, few methods have been proposed to build a quantum model with the goal to refine some of its important features using a set of different experiments. Among these experiments, high resolution x-rays and polarized neutrons diffraction, convergent beam electron diffraction, magnetic and non magnetic X-rays Compton scattering are the most popular. The joint refinement of charge and spin electron densities in position and momentum spaces from a set of different experiments, as those previously mentioned, requires the use of a common quantity known as the “one particle reduced density matrix” (1-RDM). Its role will be briefly presented. We will then explain the model(s), the method and the strategies that were adopted in constructing a general joint refinement computer code. Results from preliminary tests will be described as well as possible future joint studies.