Angular characteristics of processes of electron detachment from negative ions and hydrogen atoms in gases

The results of experimental measurement of spatial-angular distributions of hydrogen particles (H-, H-0, H+) obtained in scattering of a collimated ri bbon beam of H- ions and H-0(1s) atoms in He, Ar, Kr, Xe, H-2, O-2, and CO2 gas targets for certain values of energy in the range from 0.6 to 15 MeV a re reported. The experimental setup and the measurement procedure with an a ngular resolution of 5 x 10(-6) rad are described. The angular characterist ics of measured distributions, i.e., full width at half maximum and standar d deviation, were determined. It is shown that the shape of distribution fo r a beam of hydrogen atoms produced by neutralization of H- ions in a gas t arget varies with the type and thickness of the target, and the angular spr ead is smallest for the H-2 target. The variations in the shape of distribu tion are due to the contribution of scattering processes without changing t he charge of particles. (C) 2000 MAIK "Nauka/Interperiodica".