Ionization of helium by highly charged ions at 1. 4 MeV/amu

Journal Article · Sun Mar 15 04:00:00 EST 1987 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.35.2479· OSTI ID:6056470

McGuire, J H; Mueller, A; Schuch, B; Groh, W; Salzborn, E

Experimental cross sections for ionization of helium by projectile ions with charge Z up to Z = 44 are presented at a fixed velocity v = 7.48 a.u. corresponding to 1.4 MeV/amu. Total cross sections, summed over projectile charge states, for single ionization, sigma/sup +/, are compared to Born and Glauber calculations for point projectiles of charge Z. The Glauber calculations give a better fit to the Z dependence of the single-ionization cross sections than do the Born calculations. For double ionization, the ratio of sigma/sup 2+//sigma/sup +/ increases as Z/sup 2/ for the smaller Z and less rapidly than Z/sup 2/ for larger Z projectiles, suggesting that the so called ''direct'' mechanism for double ionization is dominant, but that the first Born approximation is breaking down for the larger Z.

• Research Organization: Institut fuer Kernphysik, Universitat Giessen, D-6300 Giessen, West Germany
• OSTI ID: 6056470
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 35:6; 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
CHARGE STATES
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELEMENTS
ENERGY RANGE
FLUIDS
GASES
GLAUBER THEORY
HELIUM
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
MEV RANGE
MEV RANGE 01-10
MULTICHARGED IONS
NONMETALS
RARE GASES
TOTAL CROSS SECTIONS