L- and M-shell x-ray production cross sections of Nd, Gd, Ho, Yb, Au, and Pb by 25-MeV carbon and 32-MeV oxygen ions
L- and M-shell x-ray production cross sections have been measured for thin solid targets of neodymium, gadolinium, holmium, ytterbium, gold, and lead by 25-MeV /sub //sub <1/ /sub 6//sup 2/C/sup q//sup +/ (q = 4,5,6) and by 32-MeV /sub //sub <1/ /sub 8//sup 6/O/sup q//sup +/ (q = 5,7,8). The cross sections were determined from measurements made with thin targets (less than 2.25 ..mu..g/cm/sup 2/). For projectiles with one or two K-shell vacancies, the target x-ray production cross sections were found to be enhanced over those for projectiles without a K-shell vacancy. The sum of direct ionization to the continuum (DI) plus electron capture (EC) to the L,M,N,. . . shells and EC to the K shell of the projectile have been extracted from the data. The results are compared to the predictions of first Born theories, i.e., plane-wave Born approximation for DI and Oppenheimer-Brinkman-Kramers formula of Nikolaev for EC, and to the ECPSSR that accounts for energy loss and Coulomb deflection of the projectile as well as for relativistic and perturbed stationary states of inner-shell electrons.
- Research Organization:
- Department of Physics, North Texas State University, Denton, Texas 76203
- OSTI ID:
- 6117260
- Journal Information:
- Phys. Rev. A; (United States), Vol. 36:8
- Country of Publication:
- United States
- Language:
- English
Similar Records
Direct ionization and electron capture in M-shell x-ray production by fluorine ions
L-shell x-ray production cross sections in Nd, Gd, Ho, Yb, Au and Pb for 25-MeV carbon and 32-MeV oxygen ions
Related Subjects
CARBON IONS
ION-ATOM COLLISIONS
GADOLINIUM
GOLD
HOLMIUM
LEAD
NEODYMIUM
OXYGEN IONS
YTTERBIUM
BORN APPROXIMATION
COMPARATIVE EVALUATIONS
CROSS SECTIONS
ION SPECTROSCOPY
L SHELL
M SHELL
MEV RANGE 10-100
X-RAY EMISSION ANALYSIS
ATOM COLLISIONS
CHARGED PARTICLES
CHEMICAL ANALYSIS
COLLISIONS
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY RANGE
ION COLLISIONS
IONS
METALS
MEV RANGE
NONDESTRUCTIVE ANALYSIS
RARE EARTHS
SPECTROSCOPY
TRANSITION ELEMENTS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena