K -shell ionization by relativistic electron impact
Journal Article
·
· Phys. Rev. A; (United States)
K-shell ionization induced by relativistic electron impact has been studied for eleven elements of 22less than or equal toZless than or equal to52 in the incident-electron energy region of 300--380 MeV. The I(K..beta..)/I(K..cap alpha..) intensity ratios and the ionization cross sections have been measured. The values of the intensity ratio are in agreement with those of previous experiments and the theoretical calculations of Scofield. Our results, along with those of previous experiments, prove the assumption that the intensity ratio is independent of the incident energy. The values of the cross section decrease with increasing Z. The decreasing tendency can be explained by Scofield's theory, but the experimental values lie systematically lower than the calculated values. The cross sections follow a power-law dependence, sigma--Z/sup -//sup ..cap alpha../, and the exponent ..cap alpha.. is evaluated to be 2.51 +- 0.13 for 300-MeV electron impact. As for the incident-energy dependence of the cross section, our results suggest a density effect in the inner-shell ionization process.
- Research Organization:
- Department of Mathematics and Physics, The National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239, Japan
- OSTI ID:
- 6925400
- Journal Information:
- Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 35:3; ISSN PLRAA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CHEMICAL ANALYSIS
COLLISIONS
CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELECTRONIC STRUCTURE
ENERGY DEPENDENCE
ENERGY RANGE
INNER-SHELL IONIZATION
IONIZATION
K SHELL
MEV RANGE
MEV RANGE 100-1000
NONDESTRUCTIVE ANALYSIS
RELATIVISTIC RANGE
SATURATION
X-RAY EMISSION ANALYSIS
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CHEMICAL ANALYSIS
COLLISIONS
CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELECTRONIC STRUCTURE
ENERGY DEPENDENCE
ENERGY RANGE
INNER-SHELL IONIZATION
IONIZATION
K SHELL
MEV RANGE
MEV RANGE 100-1000
NONDESTRUCTIVE ANALYSIS
RELATIVISTIC RANGE
SATURATION
X-RAY EMISSION ANALYSIS