L-subshell ionization in Yb, Ta, W, Pt, Au, Pb, and Th by 107-MeV Ag/sup 6 +/ ion bombardment

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5679028

Uchai, W

Effects of multiple ionization are observed in high-Z targets (above) due to bombardment by the 107-MeV Ag/sup 6 +/ projectiles. The characteristic L-subshell branching ratios of the target x-ray transitions from these multiple inner-shell vacancy atoms are observed to deviate from the single vacancy atomic state values. Energy shifts of target L x rays in the range of 140-900 eV due to the presence of satellites are detected. A multiconfiguration relativistic Dirac-Fock program is used to calculate the energy shifts of 10 prominent L x-ray transitions for various numbers of M-spectator vacancies up to 11 in these targets. The observed and the calculated energy shifts of the target L x rays and the observed L subshell branching ratios are used to obtain the number of spectator vacancies present in the target atoms. As many as 39 spectator vacancies are present in the M, N, and O shells. Larkin's method is used to obtain the multiple vacancy atomic state L shell yields by scaling the single vacancy atomic state values. From the observed L x-ray cross section ratios and the multiple vacancy atomic state L shell yields, the l-subshell ionization cross section ratios sigmaL/sub 2//sigmaL/sub 1/ and sigmaL/sub 3//sigmaL/sub 1/ are deduced and compared to the theoretical (PWBA, PWBA + EC, ECPSSR, ECPSSR + EC) predictions.

• Research Organization: Emory Univ., Atlanta, GA (USA)
• OSTI ID: 5679028
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ACTINIDES
CHARGED PARTICLES
COLLISIONS
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY RANGE
ENERGY RESOLUTION
GOLD
ION COLLISIONS
IONIZATION
IONS
L SHELL
LEAD
METALS
MEV RANGE
MEV RANGE 100-1000
PLATINUM
PLATINUM METALS
RARE EARTHS
RESOLUTION
SILVER IONS
SPECTRA
TANTALUM
THORIUM
TRANSITION ELEMENTS
TUNGSTEN
X-RAY SPECTRA
YTTERBIUM