Direct ionization and electron capture in M-shell x-ray production by fluorine ions

Journal Article · Tue Nov 01 04:00:00 EST 1983 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.28.2722· OSTI ID:5267847

Mehta, R; Duggan, J L; McDaniel, F D; Andrews, M C; Lapicki, G; Miller, P D; Rayburn, L A; Zander, A R

Measurements of M-shell x-ray production cross sections are reported for thin solid targets of /sub 79/Au, /sub 82/Pb, /sub 83/Bi, and /sub 92/U. Fluorine ions of energies 25, 27, and 35 MeV and charge states of 4, 5, 6, 8, and 9 were used. The microscopic cross sections were determined from measurements made with targets ranging in thickness from approx.1 to approx.300 ..mu..g/cm/sup 2/. An enhancement in the target M-shell x-ray production cross section was observed for fluorine ions with one or two K-shell vacancies over those without a K-shell vacancy. The sums of cross sections for direct ionization to the target continuum and electron capture to the projectile's L,M,N, . . . shells are inferred from charge state q = 4,5,6 data. The first Born calculations overpredict the cross-section data at all energies. Cross sections for electron capture from the target M shell to the projectile K shell for one (q = 8) and two (q = 9) K-shell vacancies in the projectile are also overpredicted by the first Born approximation for electron capture, i.e., the Oppenheimer-Brinkman-Kramers approximation of Nikolaev. The data are in good agreement with the ECPSSR theory of Brandt and Lapicki, which accounts for the energy-loss, Coulomb-deflection, and relativistic effects in the perturbed-stationary-state theory.

• Research Organization: Department of Physics, North Texas State University, Denton, Texas 76203
• OSTI ID: 5267847
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 28:5; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ACTINIDES
ATOM COLLISIONS
AUGMENTATION
BISMUTH
BORN APPROXIMATION
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTROMAGNETIC RADIATION
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY RANGE
FILMS
FLUORINE IONS
GOLD
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZING RADIATIONS
IONS
K SHELL
LEAD
M SHELL
METALS
MEV RANGE
MEV RANGE 10-100
MULTICHARGED IONS
PSS METHOD
RADIATIONS
THIN FILMS
TRANSITION ELEMENTS
URANIUM
X RADIATION