Electron-loss and excitation cross sections for a He/sup +/ ion colliding with various atoms

Journal Article · Tue Oct 01 04:00:00 EDT 1985 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.32.2175· OSTI ID:5264537

Kaneko, T

A unitarized impact-parameter method is applied to calculate the electron-loss and excitation cross sections for He/sup +/ ions colliding with atoms. The projectile ionization and excitation are dominantly caused by the average potential field of the target atom (atomic number Z/sub 2/). The inelastic process of exciting the target atom contributes negligibly except for light target elements. We adopt the Moliere potential to describe this average potential field. The energy dependences of the electron-loss cross sections in He, N/sub 2/, and Ar targets are in good agreement with the reported data. In the case of the Kr target, the present theory yields larger cross sections than the data, especially below 1 MeV impact energy of a He/sup +/ projectile. The calculated loss cross sections at impact velocity ranging from 2v/sub 0/ to 6v/sub 0/ (v/sub 0/ = 2.18 x 10/sup 8/ cm/s) show a weaker Z/sub 2/ dependence in the large Z/sub 2/ region than that given by the Bohr formula. As for the cross section for exciting the ground state of a projectile to the first excited state, a similar weak Z/sub 2/ dependence can be found. The recent experimental results using 40-MeV F/sup 8 +/ ions colliding with He, Ne, Ar, and Kr targets have supported this tendency.

• Research Organization: Department of Applied Physics, Okayama University of Science, Ridai-cho 1-1, Okayama 700, Japan
• OSTI ID: 5264537
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 32:4; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ATOM COLLISIONS
BORN APPROXIMATION
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUIDS
GASES
HELIUM
HELIUM IONS
IMPACT PARAMETER
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
KRYPTON
MOLIERE THEORY
NEON
NITROGEN
NONMETALS
RARE GASES