Experimental L-series x ray production cross sections for Re by tuning synchrotron radiation across its Li (i=1-3) sub-shell ionization thresholds

2021 ◽  
pp. 109599
Author(s):  
Vibha Ayri ◽  
Sandeep Kaur ◽  
Anil Kumar ◽  
M. Czyzycki ◽  
A.G. Karydas ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Cross Sections ◽  
Production Cross ◽  
X Ray ◽  
Shell Ionization

MATRIX EFFECTS ON K-SHELL IONIZATION CROSS SECTIONS IN Al/Si ALLOYS

2002 ◽  
Vol 12 (01n02) ◽  
pp. 1-5
Author(s):  
M. NEKAB ◽  
Ch. HEITZ
Keyword(s):  
Cross Sections ◽  
Matrix Effects ◽  
Production Cross ◽  
Heavy Ion ◽  
Double Scattering ◽  
Scattering Mechanism ◽  
Ionization Cross ◽  
X Ray ◽  
Ionization Cross Sections ◽  
Shell Ionization

Thick targets consisting in Al/Si alloys were bombarded with 1.0 to 5.0 MeV Ar ions. The K X-ray production cross sections were deduced from the measured yields by using the Merzbacher-Lewis formula extended to heavy ion bombardment. The density dependence on the K X-ray production cross sections of Al and Si was observed. This phenomena can be interpreted within the molecular orbital double-scattering mechanism.

K-shell ionization cross sections of K and Lα X-ray production cross sections of I by 10–30 keV electron impact

2012 ◽  
Vol 90 (2) ◽  
pp. 125-130 ◽  
Author(s):  
Y. Wu ◽  
Z. An ◽  
Y.M. Duan ◽  
M.T. Liu ◽  
X.P. Ouyang
Keyword(s):  
Experimental Data ◽  
Electron Impact ◽  
Cross Sections ◽  
Production Cross ◽  
Carbon Substrate ◽  
Ionization Cross ◽  
X Ray ◽  
Pure Carbon ◽  
Ionization Cross Sections ◽  
Shell Ionization

The absolute K-shell ionization cross sections of K and Lα X-ray production cross sections of I by 10–30 keV electron impact have been measured. The target was prepared by evaporating a thin film of compound KI to a thick pure carbon substrate. The effects of multiple scattering of electrons penetrating the target films, electrons reflected from the thick pure carbon substrates and bremsstrahlung photons produced when incident electrons impacted on the targets were corrected by using the Monte Carlo method. For K K-shell and I L-shell X-ray characteristic peaks, the spectra were fitted using the spectrum-fitting program ALLFIT to extract the Kα and Kβ peak counts more accurately for element K, and Lα peak counts for element I. The experimental results were compared with some theoretical results developed recently and available experimental data from the literature. The experimental data for I L-shell X-ray production cross sections by 10–30 keV electron impact are given here for the first time.

X-Ray Production Cross Sections for Ti, Co, Ge, Rb and Sn by 16 - 44 Mev Oxygen Ion Bombardment

1973 ◽  
Vol 17 ◽  
pp. 445-456
Author(s):  
R. F. Chaturvedi ◽  
J. L. Duggan ◽  
T. J. Gray ◽  
C. C. Sachtleben ◽  
J. Lin
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
X Rays ◽  
X Ray ◽  
Oxygen Ions ◽  
Oxygen Ion ◽  
Theoretical Predictions ◽  
Ionization Cross Sections ◽  
Binary Encounter Approximation ◽  
Shell Ionization

AbstractAbsolute K-shell ionization cross sections were measured for Ti, Co, Ge, Rb, and Sn for incident oxygen ions from 16-44 MeV. The x-rays were measured with a high resolution Si(Li) detector (166 eV at 5.9 keV). All of the data represents cross section measurements for thin targets. The measured cross sections for these elements are compared to the theoretical predictions of the Binary Encounter Approximation (BEA). Kα/Kβratios and energy shifts were also extracted from the data. The experimental data are compared to measured cross sections for other elements to give an overview of the systematics for oxygen ion induced x-ray production cross sections in this energy range. Some comment will also be given in regard to the use of oxygen ions to measure the parameters associated with ion implanted semiconductors.

X-RAY PRODUCTION, INNER SHELL IONIZATION AND READING’S THEOREM IN ION · ATOM COLLISIONS

1992 ◽  
Vol 02 (03) ◽  
pp. 197-209
Author(s):  
KEIZO ISHII
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Production Cross ◽  
X Rays ◽  
Ionization Cross ◽  
Heavy Charged Particles ◽  
X Ray ◽  
Inner Shell Ionization ◽  
Ionization Cross Sections ◽  
Shell Ionization

When a solid or gaseous target is bombarded with heavy charged particles, inner shell electrons of target atoms are ionized and characteristic x rays are produced. We can easily observe these x rays with a Si(Li) detector and derive inner-shell ionization cross section from the x-ray production cross sections. In this paper, we make a review of x-ray production, inner shell ionization and Reading’s theorem in light ion·atom collisions. This theorem is one of the most important ones in the ion·atom collision physics and permits precise discussion on comparison between experimental inner-shell ionization cross sections obtained with a Si(Li) detector and the calculations based on usual theories where the incident particle is assumed to interact with only one electron in an atom and the presence of other electrons is ignored.

Synchrotron radiation induced X-ray production cross sections of 66 Dy at energies across its Li (i  = 1-3) subshell absorption edges

2017 ◽  
Vol 47 (1) ◽  
pp. 11-21 ◽  
Author(s):  
Rajnish Kaur ◽  
Anil Kumar ◽  
M. Czyzycki ◽  
A. Migliori ◽  
A.G. Karydas ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Cross Sections ◽  
Production Cross ◽  
X Ray ◽  
Radiation Induced ◽  
Absorption Edges

K-SHELL X-RAY PRODUCTION BY PROTONS IN VACUUM AND GASEOUS ENVIRONMENT

1993 ◽  
Vol 03 (01) ◽  
pp. 31-44
Author(s):  
N. KALLITHRAKAS-KONTOS ◽  
A.A. KATSANOS
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Suitable Model ◽  
External Beam ◽  
Secondary Electrons ◽  
X Ray ◽  
Gaseous Environment ◽  
Beam Technique ◽  
Shell Ionization

The yields of Kα x-ray production from the bombardment of metal targets with protons were measured in vacuum and in gaseous environment (external beam technique) for proton energies between 1.5 and 8 MeV. For the measurements in gaseous environment the influence of the secondary electrons (delta electrons) emitted from the gas, to the x-ray yields was investigated. For this purpose a suitable model was introduced and tested experimentally. Finally, the experimental K shell ionization and x-ray production cross sections were calculated for the same targets and compared with three theoretical and two semiempirical approximations.

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