| Vol. 53,
No. 5 November 1999 pp. 869-875 Energy spectrum of ejected electrons in ionization of hydrogen atoms by electrons J N DAS and S DHAR Department of Applied
Mathematics, University College of Science, 92 Acharya
Prafulla Chandra Road, Calcutta 700 009, India Abstract. Energy spectrum of ejected electrons in ionization of hydrogen atoms has been calculated following a multiple scattering theory of Das and Seal [15]. The results show peaks around two to three Rydbergs of energies of the ejected electrons, for incident electron energy of 250 eV and 500 eV, considered here, and for different combinations of the angular variables of the scattered and the ejected electrons, for scattering in a plane. The peaks are very similar to those observed in relativistic K-shell ionization of Ag atoms by electrons at 500 KeV energy [6]. The physical origin of these peaks may be traced to the second order scatterings, scattering first by the atomic nucleus (or the atomic electron) and then a second time by the atomic electron. These peaks are, however, absent in the first Born results. Experimental verification of the present results and theoretical calculation by some other well-known methods will be interesting. Keywords. Cross-section; collision; ionization; spectrum; electron. PACS No. 34.80 Dp |