Excitation cross sections of the 1S and 1P deg. levels of a Sr atom in electron-Sr atom collisions

The excitation of the singlet S and P deg. levels of a Sr atom from the ground state by slow electrons was studied by the method of extended crossing beams. It was ascertained that perturbations manifest themselves in the behavior of the excitation cross sections in the spectral series arising as a result of the transitions from these levels. The perturbations affect to a larger extent the form of the optical excitation functions rather than the absolute values of the cross sections. The results obtained are compared with previous data