L-subshell ionization cross sections for Hf, Ta, and W by H/sup +/ and He/sup +/ bombardment

Journal Article · Tue Jan 01 04:00:00 EST 1980 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.21.73· OSTI ID:5635650

Justiniano, E L.B.; Nader, A A.G.; de Castro Faria, N V; Barros Leite, C V; de Pinho, A G

X rays resulting from L-subshell vacancies in Hf, Ta, and W produced by bombarding thin targets with H/sup +/ (0.6--2.5 MeV) and He/sup +/ (1.2-- 4.2 MeV) were detected by Si(Li) spectrometry. Ionization cross sections were obtained by using the above measurements, branching ratios from theoretical calculations, and values of the fluorescence yields and Coster-Kronig factors by interpolating from experimental data. The observed projectile-energy dependence of the L/sub II/-subshell ionization cross section is reproduced reasonably well by the plane-wave Born approximation (PWBA), but the introduction of relativistic, trajectory, and binding corrections (PWBA-BTR) are essential for the description of the L/sub I/ and L/sub III/ data. Scaling of the H/sup +/ and He/sup +/ data shows that one agrees well with the other. The behavior of the ionization cross section versus bombarding energy is correlated with some special features of the electronic bound-state wave functions.

• Research Organization: Department of Physics, Catholic University, Rio de Janeiro, Brazil
• OSTI ID: 5635650
• Journal Information: Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 21:1; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOMIC IONS
BEAMS
CATIONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY DEPENDENCE
ENERGY RANGE
HAFNIUM
HELIUM IONS
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
ION BEAMS
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
L SHELL
METALS
MEV RANGE
MEV RANGE 01-10
REFRACTORY METALS
SPECTRA
TANTALUM
TRANSITION ELEMENTS
TUNGSTEN
X-RAY SPECTRA