Differential cross sections for ejection of electrons from rare gases by 7. 5--150-keV protons

Journal Article · Wed Mar 01 04:00:00 EST 1989 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.39.2359· OSTI ID:6397068

Cheng, W; Rudd, M E; Hsu, Y

Absolute cross sections for the ejection of electrons by proton impact that are differential in the angle and energy of the electrons have been measured for helium, neon, and krypton. The primary energy ranged from 7.5 to 150 keV, the angles from 10/sup 0/ to 160/sup 0/, and the measured energies from 1 to 550 eV. These data along with earlier data on argon are used to study the systematics of proton-impact ionization of the rare gases. An analytical model is employed to correlate and systematize the cross-section differential in ejected-electron energy. For low-energy collisions the angular distribution of electrons ejected into the forward hemisphere is found to be independent of the electron energy and largely independent of the target. The Massey adiabatic criterion yields results for the energy of the maxima of the electron-ejection functions, in disagreement with experiment. Doubly differential cross sections for neon calculated from the distorted-wave Born approximation show only fair agreement with experimental data. A method of determining electron multiplier efficiency based on Poisson statistics is described.

• Research Organization: Behlen Laboratory of Physics, University of Nebraska, Lincoln, Nebraska 68588-0111
• OSTI ID: 6397068
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 39:5; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
BORN APPROXIMATION
CATIONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
ELECTRON SPECTRA
ELEMENTS
ENERGY RANGE
EXPERIMENTAL DATA
FLUIDS
GASES
HELIUM
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
INFORMATION
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
KEV RANGE
KRYPTON
NEON
NONMETALS
NUMERICAL DATA
RARE GASES
SPECTRA