Influence of multipole effects on the cross section and alignment following inner-shell ionization of atoms by a linearly polarized photon

2019 ◽  
Vol 235 ◽  
pp. 60-67 ◽  
Author(s):  
Zhan-Bin Chen ◽  
Kun Ma ◽  
Cui-Cui Sang ◽  
Xiang-Li Wang ◽  
Kai Wang
Keyword(s):  
Cross Section ◽  
Linearly Polarized ◽  
Inner Shell Ionization ◽  
The Cross ◽  
Shell Ionization

The inner shell ionization of atoms by electron impact

1940 ◽  
Vol 36 (1) ◽  
pp. 43-52 ◽  
Author(s):  
E. H. S. Burhop ◽  
H. S. W. Massey
Keyword(s):  
Experimental Data ◽  
Electron Impact ◽  
Cross Section ◽  
Nickel Silver ◽  
Inner Shell Ionization ◽  
Good For ◽  
The Cross ◽  
Shell Ionization ◽  
Good Agreement

Calculations have been made of the cross-section for ionization of the inner shells of atoms by electron impact in the cases of the K-shells of nickel, silver, mercury and of the three L-shells of silver and mercury.The agreement with experiment is reasonably good for the K-shell ionization, but only fair in the case of the rather meagre experimental data available for the L-shell. The values obtained for the relative ionization in the K- and L-shells are in good agreement with those to be expected from experiment.

scholarly journals CROSS SECTION ASYMMETRY OF THE 12C(γ,p0)11B AND 12C(γ,p1)11B REACTIONS AT PHOTON ENERGIES 40...55MeV

2019 ◽  
pp. 26-37
Author(s):  
D.D. Burdeinyi ◽  
J. Brudvik ◽  
V.B. Ganenko ◽  
K. Hansen ◽  
K. Fissum ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Energy Range ◽  
Cross Section ◽  
Relative Contribution ◽  
Linearly Polarized ◽  
The Asymmetry ◽  
The Cross ◽  
Tagged Photons

The asymmetry of the cross section of the 12C(γ,p0)11B and 12C(γ,p1)11B reactions has been measured in the energy range 40...55MeV using linearly polarized tagged photons of the MAX-lab facility. The asymmetry of the process 12C(⃗γ,p0)11B is Σ ≈ 0.85, that implies one-particle reaction mechanism. The asymmetry of the reaction 12C(⃗γ,p1)11B is smaller, Σ ≈ 0.6...0.7, that may be due to the stronger relative contribution of the 2h−1p mechanism to the dominant one-particle reaction mechanism.

Absolute cross-section measurements of inner-shell ionization

1994 ◽  
Vol 89 (1) ◽  
pp. 119-125 ◽  
Author(s):  
Hans Schneider ◽  
Ingo Tobehn ◽  
Frank Ebel ◽  
Rainer Hippler
Keyword(s):  
Cross Section ◽  
Absolute Cross Section ◽  
Inner Shell Ionization ◽  
Shell Ionization

Inner-Shell Ionization Cross Sections

1990 ◽  
Vol 48 (2) ◽  
pp. 6-7
Author(s):  
C. J. Powell
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Relativistic Correction ◽  
Bethe Equation ◽  
Ionization Cross ◽  
Section Data ◽  
Inner Shell Ionization ◽  
Ionization Cross Sections ◽  
Image Position ◽  
Shell Ionization

Values of cross sections for ionization of inner-shell electrons by electron impact are required for electron probe microanalysis, Auger-electron spectroscopy, and electron energy-loss spectroscopy. The present author has reviewed measurements and calculations of inner-shell ionization cross sections. This paper is an update and summary of these previous reviews.It is convenient to start with the Bethe equation for inner-shell ionization cross sections which is frequently used (and misused) in x-ray microanalysis:(1)where σnℓ is the cross section for ionization of the nℓ shell with binding energy Enℓ by incident electrons of energy E. The terms bnℓ and cnℓ are the Bethe parameters discussed further below. It has been assumed in the derivation of Eq. (1) that E ≫ Enℓ ; this requirement will also be discussed. Finally, it has been assumed here that E is low enough (≲50 keV) so that a relativistic correction is unnecessary.The extent to which a given set of measured or calculated cross-section data is consistent with Eq. (1) can be determined from a Fano plot in which σnℓE is plotted versus ℓnE; if such a plot is linear, Eq. (1) is consistent with the data and values of the Bethe parameters can be easily derived.

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