2s-ns (n = 3-6) and 2s-3p excitation of hydrogen atom by electron impact

Excitation of hydrogen atom from its metastable 2s-state to ns (n = 3, 4, 5, 6) and np (n = 3) states has been investigated by employing a distorted wave method in the frame work of the two potential formulation. Effect of exchange is included by antisymmetrizing the total wave function of the system. The angle integrated cross sections are reported at medium energies. The present 2s-3s excitation integrated cross sections are found to be in very good agreement with the most elaborate recent calculation of Odgers et al. at medium energies. 2s-6s results are being reported for the first time. (orig.)