The different levels of hybridization of the
4f electron with the conduction band in
Ce compounds give rise to a wide variety of magnetic and electronic properties which allows
the analysis of different aspects of the e-e interactions. In particular,
CeM
2Si
2 compounds and their alloys (
M
being a 3d or 4d transition metal) present different physical behaviors such as long range magnetic
order, heavy fermion character, paramagnetism, non-magnetic order with magnetic correlations, and
superconductivity among others. In this work we obtain the hybridization function,
![$\Gamma(\epsilon)$](FMC02/img50.gif)
, of several
CeM
2Si
2 systems performing
ab-initio
calculations. This function gives information about the energy distribution of the hybridization
of the
4f state with the conduction band. We solve the Anderson Impurity Hamiltonian with
the
Non-Crossing Approximation taking
![$\Gamma(\epsilon)$](FMC02/img50.gif)
as an input parameter. With this many body approach
we study the crystal electric field splittings of the
4f level, the spectral properties and
some aspects of the Kondo phenomena.