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 d istorted wave method in the frame work of the two potential formulatio n. Effect of exchange is included by antisymmetrizing the total wave f unction of the system. The angle integrated cross sections are reporte d at medium anergies. The present 2s-3s excitation integrated cross se ctions are found to be in very good agreement with the most elaborate recent calculation of Odgers ct al. at medium energies. 2s-6s results am being reported for the first time.