K -shell x-ray production in sub 6 C, sub 8 O, sub 9 F, sub 11 Na, sub 12 Mg, and sub 13 Al by 0. 5--8. 0-MeV helium ions

• Published in: Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 1991-12, Vol.44:11
• Main Authors: Yu, Y.C., McNeir, M.R., Weathers, D.L., Duggan, J.L., McDaniel, F.D., Marble, D.K., Zhao, Z.Y., Lapicki, G.
• Format: Article
• Language: English
• Subjects: 664300 - Atomic & Molecular Physics- Collision Phenomena- (1992-); ALKALI METALS; ALKALINE EARTH METALS; ALUMINIUM; ATOM COLLISIONS; ATOMIC AND MOLECULAR PHYSICS; BEAMS; CARBON; CHARGED PARTICLES; CHEMICAL ANALYSIS; COLLISIONS; CROSS SECTIONS; ELECTRONIC STRUCTURE; ELEMENTS; ENERGY RANGE; FLUORINE; HALOGENS; HELIUM IONS; INNER-SHELL IONIZATION; ION BEAMS; ION COLLISIONS; ION-ATOM COLLISIONS; IONIZATION; IONS; K SHELL; MAGNESIUM; METALS; MEV RANGE; MEV RANGE 01-10; NONDESTRUCTIVE ANALYSIS; NONMETALS; OXYGEN; SODIUM; X-RAY EMISSION ANALYSIS
• ISSN: 1050-2947; 1094-1622
• DOI: 10.1103/PhysRevA.44.7252

{ital K}-shell x-ray production cross sections are reported for incident {sup 4}He ions for elements with {ital K}-shell binding energies between 277 eV (C) and 1487 eV (Al). The data are compared with the first-order Born approximation (plane-wave Born approximation for direct ionization and Oppenheimer-Brinkman-Kramer approximation for electron capture) and to the energy loss and Coulomb deflection effects, perturbed stationary-state approximation with relativistic correction (ECPSSR) theory. The energy of the helium ions ranged from 0.5 to 6.0 MeV for He{sup +} and 6.5 to 8.0 MeV for He{sup 2+}. The targets used in these measurements were {sub 6}C, {sub 8}O, {sub 9}F, {sub 11}Na, {sub 12}Mg, and {sub 13}Al. Except for a systematic overprediction of the data at the lower projectile velocities, the ECPSSR theory is found to fit the data. The first-order Born theory is found to fit the data at higher energy, but greatly overpredicts the data at low energy.