Ionisierungs- und Umladequerschnitte von Wasserstoff-Atomen und Ionen von 9 bis 60 keV in Wasserstoff

Abstract

This paper describes the measurement of ionization and charge exchange cross-sections for hydrogen atoms (H0), Protons (H+) and molecular hydrogen ions H2+ and H3+ in hydrogen gas in the energy range 9 to 60 keV. Further, the emission of secondary electrons from copper-beryllium by impact of these particles was measured. A beam of monoenergetic neutral hydrogen atoms was produced by charge exchange of a beam of protons in a gas chamber. Separation of the charged and uncharged components was accomplished by a magnetic field. The pressure in the chamber in which the cross-sections were measured was so low, that only a few particles of the incident beam suffered an effective collision. The positive and negative charges, which were produced by ionization and charge exchange along the path of the beam, were extracted by a transverse electric field and the saturation current was measured. The intensity of the neutral beam was determined at the same time by repeated charge exchange in an 80 mμ thick foil of aluminiumoxide.