K-shell ionization of elements /sub 15/P to /sub 28/Ni for 0. 4 to 3. 8 MeV/amu /sup 10//sub 5/B-ion bombardment

Journal Article · Tue Aug 01 04:00:00 EDT 1978 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.18.380· OSTI ID:6672355

Monigold, G; McDaniel, F D; Duggan, J L; Rice, R; Toten, A; Mehta, R; Miller, P D

K-shell x-ray production cross sections, K..beta../K..cap alpha.. x-ray intensity ratios and K..cap alpha.. and K..beta.. x-ray energy shifts have been determined for thin solid targets of /sub 15/P, /sub 19/K, /sub 20/Ca, /sub 21/Sc, /sub 22/Ti, /sub 23/V, /sub 25/Mn, /sub 26/Fe, /sub 27/Co, and /sub 28/Ni for 4--38-MeV /sup 10//sub 5/B ion bombardment. Comparisons of the cross sections were made to direct Coulomb ionization and electron-capture theories by means of fluorescence yields corrected for multiple-ionization effects. The dominant contribution to K-vacancy production for these projectile-target combinations is believed to be direct ionization. Electron capture is expected to be important only for the lighter target elements and then primarily at the higher velocities. The direct-ionization theories employed were the binary-encounter approximation and the plane-wave Born approximation (PWBA) both of which overestimated the experimental data especially at the lower incident ion velocities. The PWBA was modified for increased target-electron binding, Coulomb deflection of the incident ion, polarization of the target-electron wave functions due to the passage of the incident ion, and relativistic target-electron velocities. The experimental data were found to agree quite well with the sum of the theoretical predictions of the modified PWBA and electron capture.

• Research Organization: Department of Physics, North Texas State University, Denton, Texas 76203
• OSTI ID: 6672355
• Journal Information: Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 18:2; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ALKALI METALS
ALKALINE EARTH METALS
ATOM COLLISIONS
ATOMIC IONS
BEAMS
BORON IONS
CALCIUM
CHARGED PARTICLES
COBALT
COLLISIONS
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY RANGE
ION BEAMS
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
IRON
K SHELL
KEV RANGE
KEV RANGE 100-1000
MANGANESE
METALS
MEV RANGE
MEV RANGE 01-10
NICKEL
NONMETALS
PHOSPHORUS
POTASSIUM
SCANDIUM
SPECTRA
TITANIUM
TRANSITION ELEMENTS
X-RAY SPECTRA