Résumé:
Schwinger variational approach to the process of direct electronic
excitation of atoms by impact of ions at intermediate impact energies was shown to be
very successful in predicting the saturation of excitation cross sections when the
projectile charge is increased. In this study, our new approach is based on the
fractional form of the Schwinger variational principle and applied to study the
excitation of Ar16+ (1s2) ions impinging at 13.6 MeV/u (23 a.u) by various atoms of
nuclear charges Zp (2≤ ZT ≤ 54) which include neutral gaseous (He, N2 , Ne, Ar, Kr, Xe).
Our theoretical calculations of the excitation cross sections stay in good agreement
with experimental data of Adoui et al
