Equilibrium charge state distributions of 1--30 keV atomic projectiles transiting thin carbon foils

Conference · Thu Oct 01 04:00:00 EDT 1992

OSTI ID:10183290

Funsten, H O; Barraclough, B L; McComas, D J

We have investigated the exit charge state distributions of 1--30 keV H, He, C, N, O, Ne, and Ar ions that transit thin carbon foils. In this velocity regime which is less than the Bohr velocity, the dominant charge states are neutrals and singly positive ions. Therefore, the charge state distributions are dependent primarily on electron loss by neutrals with an associated electron loss cross section al and electron capture by singly ionized species with an associated electron capture cross section {sigma}{sub c}. Using empirical charge state distributions, the ratio {sigma}{sub 1}/{sigma}{sub c} is shown to have a quadratic dependence on the projectile velocity and is fit to the equation A(E{sub F}-E{sub T})/m where E{sub F} is the exit projectile energy, m is its mass, and A and E{sub T} are constants. A pronounced shell effect is observed: the constant A is dependent on the principle quantum number of the projectile, and E{sub T} depends on the number of projectile valence electrons.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 10183290
• Report Number(s): LA-UR--92-2913; CONF-9209200--5; ON: DE93000792
• Country of Publication: United States
• Language: English

Related Subjects

664400
665300
74 ATOMIC AND MOLECULAR PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CARBON
CHARGE DISTRIBUTION
CHARGE STATE
CROSS SECTIONS
ELECTRON CAPTURE
ELECTRON DETACHMENT
EXPERIMENTALLY DERIVED INFORMATION ON ATOMIC AND MOLECULAR PROPERTIES
FOILS
INTERACTIONS BETWEEN BEAMS AND CONDENSED MATTER
ION COLLISIONS
STOPPING POWER