Accession Number : ADA182457

Title :   Excitations during Collisionally-Induced Electron-Detachment of Negative Ions.

Descriptive Note : Final rept. 1 Aug 83-31 Dec 86,

Corporate Author : GEORGIA UNIV ATHENS DEPT OF PHYSICS

Personal Author(s) : Menendez,M G

PDF Url : ADA182457

Report Date : Jun 1987

Pagination or Media Count : 20

Abstract : This research has had its main thrust the detailed investigation of the electron loss processes of H- in collisions with neutral atoms (mainly He) and some measurements associated with projectile excitation in ion-atom collisions. Measurements have been made on the energy spectrum of detached electrons at a laboratory scattering angle of zero in coincidence with Lyman-alpha photons from the excitation and subsequent decay of H(2p) produced during the process, H- + He becoming H(2p) + e- + He*, at 0.5 MeV incident ion energy. It was found that this electron energy distribution mimics the so-called very sharp peak feature of the doubly differential cross section previously measured under e- and H coincidence conditions. This result shows that excitation of H is responsible for the very sharp peak and that the detached electron energy distribution associated with H(2p) is significantly different from the distribution associated with the production of H(1s).

Descriptors :   *CHARGE TRANSFER, *ION BEAMS, *PARTICLE COLLISIONS, DIFFERENTIAL CROSS SECTIONS, ELECTRONS, LOSSES, ENERGY, SPECTRA, ATOMS, COLLISIONS, IONS, ANIONS, EXCITATION, PROJECTILES, DISTRIBUTION, ELECTRON ENERGY, ELECTRONS, ANGLES, LABORATORIES, SCATTERING, NEUTRAL, PEAK VALUES, SHARPNESS, HYDROGEN, HELIUM

Subject Categories : Physical Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE