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Doubly differential cross sections for production of electrons in collisions of e/sup -/, H/sup +/, and H/sup 9/ with water vapor molecules

Thesis/Dissertation ·
OSTI ID:5481274
Absolute cross sections, differential in angle and ejection energy, for electron production by electron, proton, and atomic hydrogen impact on water vapor have been measured using electrostatic analysis and counting of individual secondary electrons. The range of projectile energies was 15-150 keV for proton, 20-150 keV for neutral hydrogen and 50-2000 eV for electron impact. The experiment was performed under static gas conditions. In the case of proton and neutral hydrogen impact, the ejection angle ranged from 10/sup 0/ to 160/sup 0/ and the ejected electron energies were measured from 1.0 to 300 eV. The higher energy proton impact data was compared with different theoretical calculations, i.e., the DDCS-MT treatment of B. Senger with and without the Salin's factor and a binary encounter calculation for singly differential cross sections. The results were also compared with the available experimental data at higher impact energies. A comparative study was done to point out similarities and differences between the three different projectiles. The study showed that neutrals and protons act similarly in the hard collision region, while the neutrals and electrons show similar behavior at the very low ejected electron energies. The spectra from neutral impacts showed the effect of the additional mechanisms of the electron loss to the continuum and the screening of electrons.
Research Organization:
Nebraska Univ., Lincoln (USA)
OSTI ID:
5481274
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
ANGULAR DISTRIBUTION
ATOM COLLISIONS
ATOMIC BEAMS
BEAMS
CATIONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DISTRIBUTION
ELECTRON COLLISIONS
ELECTRON EMISSION
ELEMENTS
EMISSION
ENERGY RANGE
EV RANGE
FLUIDS
GASES
HYDROGEN
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
ION COLLISIONS
IONS
KEV RANGE
NONMETALS
SECONDARY EMISSION
VAPORS
WATER VAPOR