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Measurement of spin-exchange effects in electron-hydrogen collisions: Impact ionization. [15 to 197 eV; asymmetry measurements]

Journal Article · · Phys. Rev. Lett.; (United States)
We have measured the interference between the direct and exchange scattering amplitudes in electron impact ionization of atomic hydrogen over the energy range 15 to 197 eV in a crossed-beams experiment utilizing spin-polarized electrons and spin-polarized hydrogen atoms. The experimental values for the asymmetry A = (sigma/sup arrow-up arrow-down/ - sigma/sup arrow-up arrow-up/) / (sigma/sup arrow-down arrow-up/ + sigma/sup arrow-up arrow-up/) in the total ionization cross section for antiparallel and parallel incident- and atomic-electron spins are inconsistent with all theoretical calculations below 50 eV.
Research Organization:
J. W. Gibbs Laboratory, Yale University, New Haven, Connecticut 06520
OSTI ID:
7319337
Journal Information:
Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 39:6; ISSN PRLTA
Country of Publication:
United States
Language:
English