[en] Glauber's approximation is used to study discrete excitations in alkali atoms by electron impact. The interaction between the incident electron and the core electrons and (N-1) nuclear charges is described through an Yukawa-like potential. Analitical expressions for m²S and m²P excitations are obtained, as well as numerical results for several excitations processes in alkali atoms. (Author)

[en] Generalized oscillator strength (GOS) and optical oscillator strength are calculated within the First Born Approximation for several electronic transitions from the three 1s-core orbitals to the first unoccupied molecular orbitals of the N₂O molecule. The molecular wave functions were obtained by using the configuration-interaction method, with a Hartree-Fock basis for the occupied molecular orbitals relaxed for each electronic state and improved virtual orbitals for the unoccupied orbitals. For the N1s-π* excitations, the GOS as a function of the transferred momentum K has just a slight dependence on the chemical environment of the two inequivalent nitrogen atoms. However, for the N1s-nsσ excitations, the GOS profiles have completely distinct behaviors, depending on the nitrogen atom from which the excitation takes place. A discussion on the origin of this GOS profile is made and an explanation is proposed

[en] Published in summary form only

[en] Published in summary form only

[en] Published in summary form only

No abstract available

No abstract available

No abstract available

No abstract available

No abstract available