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
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Related Subjects
640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
AMPLITUDES
ASYMMETRY
ATOM COLLISIONS
BEAMS
BORN APPROXIMATION
COLLIDING BEAMS
COLLISIONS
CROSS SECTIONS
CRYOGENIC FLUIDS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELEMENTS
ENERGY RANGE
EV RANGE
EV RANGE 10-100
EV RANGE 100-1000
EXCHANGE INTERACTIONS
FLUIDS
HYDROGEN
INTERACTIONS
INTERFERENCE
IONIZATION
NONMETALS
ORIENTATION
POLARIZED BEAMS
POLARIZED TARGETS
SCATTERING AMPLITUDES
SPIN ORIENTATION
TARGETS
TOTAL CROSS SECTIONS
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
AMPLITUDES
ASYMMETRY
ATOM COLLISIONS
BEAMS
BORN APPROXIMATION
COLLIDING BEAMS
COLLISIONS
CROSS SECTIONS
CRYOGENIC FLUIDS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELEMENTS
ENERGY RANGE
EV RANGE
EV RANGE 10-100
EV RANGE 100-1000
EXCHANGE INTERACTIONS
FLUIDS
HYDROGEN
INTERACTIONS
INTERFERENCE
IONIZATION
NONMETALS
ORIENTATION
POLARIZED BEAMS
POLARIZED TARGETS
SCATTERING AMPLITUDES
SPIN ORIENTATION
TARGETS
TOTAL CROSS SECTIONS