K-shell x-ray production cross-sections in carbon, oxygen, fluorine, sodium, magnesium, and aluminum by 0. 5 to 8. 0 MeV protons, helium, and lithium ions

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5258945

Yu, Yuehchung

X-ray production cross sections are reported for elements with K-shell x-ray energies between 277 eV (C) and 1487 eV (Al). These data are reported for incident ions in the energy range 0.5 to 8.0 MeV. These measurements were performed using the 3 MV tandem accelerator at the University of North Texas Ion Beam Modification and Analysis Laboratory. The x-ray measurements were made with a windowless Si(Li) detector that was calibrated for efficiency by comparing bremsstrahlung spectra from electron bombardment of aluminum, silver, and gold with theoretically determined bremsstrahlung spectral distributions. The experimental results of the x-ray cross sections are compared to the predictions of both the first Born and the ECPSSR ionization the theories using single-hole fluorescence yields; each of which is composed of two parts; the direct ionization (DI) of the target electron to the continuum and the capture (EC) of the target electron to the projectile. The first Born theory describes DI by the Plane-Wave-Born-Approximation (PWBA) and EC by the Oppenheimer-Brinkman-Kramers treatment of Nikolaev (OBKN). The ECPSSR theory accounts for the energy loss (E) and Coulomb deflection (C) of the projectile as well as for the perturbed stationary states (PSS) and the relativistic nature (R) of inner shell electrons. The ECPSSR and first Born theoretical predictions are, in close agreement with each other and both generally, fit the proton data quite well. For incident helium and lithium ions, most of the measurement results compare quite favorably with the ECPSSR theory.

• Research Organization: University of North Texas, Denton, TX (United States)
• OSTI ID: 5258945
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ACCELERATORS
ALKALI METALS
ALKALINE EARTH METALS
ALUMINIUM
ATOM COLLISIONS
BORN APPROXIMATION
CAPTURE
CARBON
CATIONS
CHARGED PARTICLES
COLLISIONS
COMPARATIVE EVALUATIONS
CROSS SECTIONS
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE
ELECTROSTATIC ACCELERATORS
ELEMENTS
ENERGY LOSSES
ENERGY RANGE
EVALUATION
FLUORESCENCE
FLUORINE
HALOGENS
HELIUM IONS
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
INNER-SHELL IONIZATION
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONIZING RADIATIONS
IONS
LITHIUM IONS
LOSSES
LUMINESCENCE
MAGNESIUM
MEASURING INSTRUMENTS
METALS
MEV RANGE
MEV RANGE 01-10
NONMETALS
OXYGEN
RADIATION DETECTORS
RADIATIONS
SEMICONDUCTOR DETECTORS
SI SEMICONDUCTOR DETECTORS
SODIUM
TANDEM ELECTROSTATIC ACCELERATORS
X RADIATION