Electron-loss processes of one- and two-electron atoms colliding with ions
Using the Perturbed Stationary State method, including electron translation factors, the author has calculated electron capture cross sections for the helium like ions Be{sup 2+} and B{sup 3+} incident on ground state atomic hydrogen. The molecular structure calculation employs pseudo-potentials to represent the inactive K-shell electrons on the incident ions. The calculated cross sections vary rapidly in the 10{sup 7} cm/sec velocity range (E {approximately} 1 keV/amu). The calculations show preferential transfer to the Be{sup +}(2s) and the B{sup 2+}(2p) product states. Ionization cross sections for the four combinations of electrons of electrons and positrons on H and He{sup +} have been investigated at energies near the threshold for ionization using the classical trajectory Monte Carlo method. In addition charge-exchange cross sections have been calculated for the positron-impact collisions. The ionization cross sections compare well with the predictions of the Wannier and Klar models and experimental observations. The results indicate that the Wannier-type threshold behavior may extend to higher energies than was previously thought. Electron loss cross sections have been calculated for fully-stripped ions with charge states +1 to +100 colliding with helium atoms in the energy range 100 keV/amu to 1000 keV/amu. The Classical Trajectory Monte Carlo method was used along with a newly developed semiclassical model of the helium atom with two active electrons. The reactions studied were single and double ionization, single and double electron capture, and electron capture plus ionization. Cross sections for the single electron removal reactions agree well with experimental data. Double electron removal cross sections are in qualitative agreement with experimental results.
- Research Organization:
- Missouri Univ., Rolla, MO (USA)
- OSTI ID:
- 6982028
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
ATOM COLLISIONS
BERYLLIUM IONS
BORON IONS
CAPTURE
CATIONS
CHARGE EXCHANGE
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DATA
ELECTRON CAPTURE
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELECTRON-ION COLLISIONS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
HELIUM IONS
HYDROGEN
INFORMATION
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
LEPTONS
MONTE CARLO METHOD
NONMETALS
NUMERICAL DATA
POSITRON COLLISIONS
POSITRON-ATOM COLLISIONS
POSITRON-ION COLLISIONS
POSITRONS
THEORETICAL DATA