Ion-atom differential cross sections at intermediate energies

Journal Article · Fri Apr 01 04:00:00 EST 1983 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.27.1871· OSTI ID:6083546

Olson, R E

The classical-trajectory Monte Carlo method has been used to calculate H/sup +/+H(1s) electron-capture and ionization differential cross sections in the range 25--200 keV. The results indicate the importance of including excited product states to describe the small-angle electron-capture scattering. Angular scattering of the electron removed by the ionization process has been studied as a function of ejected-electron velocity v/sub e/. The classical calculations are in reasonable agreement with coupled-channel results of Shakeshaft (Phys. Rev. A 18, 1930 (1978)) as to the ''electron capture to the continuum'' (ECC) component of the ionization process where this term is defined as the ejected electron being more closely centered to the projectile than the target nucleus after the collision. The ECC cross section sigma/sub ECC/ was studied as a function of collision energy (50--500 keV/amu) and projectile charge state (q = 1--10). At high energies, sigma/sub ECC/ scales as q/sup 2.3//E/sup 2.5/. The maximum value for sigma/sub ECC/ was determined to be an energy E/sub max/approx. =(56 keV/amu)q/sup 0.4/. Restricting the ECC component to small electron-scattering angles, theta/sub lab/< or =5/sup 0/, and electron-ejection velocities v/sub e/ = v/sub p/(1.0 +- 0.1), where v/sub p/ is the projectile velocity, indicates this process is a minor component of the total ionization cross section at intermediate energies.

• Research Organization: Physics Department, University of Missouri, Rolla, Missouri 65401
• OSTI ID: 6083546
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 27:4; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular &amp; Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
ATOM COLLISIONS
CAPTURE
CATIONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELECTRON CAPTURE
ELECTRON LOSS
ELEMENTS
ENERGY RANGE
HYDROGEN
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
KEV RANGE
KEV RANGE 10-100
KEV RANGE 100-1000
MONTE CARLO METHOD
NONMETALS
SCATTERING
SMALL ANGLE SCATTERING
TRAJECTORIES