Analytical Cross Section Approximation for Electron Impact Ionization of Alkali and Other Metals, Inert Gases and Hydrogen Atoms

The paper presents an analysis of data on the cross sections of electron impact ionization of atoms of alkali metals, hydrogen, noble gases, some transition metals and Al, Fe, Ni, W, Au, Hg, U. For the selected sets of experimental and theoretical data, an optimal analytical formula is found and approximation coefficients are calculated. The obtained semi-empirical formula reproduces the values of the ionization cross sections in a wide range of energies with an accuracy of the order of error of the available theoretical and experimental data.

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Direct Ionization Cross Sections of Uranium Atom By Electron Impact

Journal of Mountain Research ◽

10.51220/jmr.v16i2.19 ◽

2021 ◽

Vol 16 (2) ◽

Author(s):

Shivani Gupta ◽

Piyush Sinha

Keyword(s):

Electron Impact ◽

Cross Sections ◽

Impact Ionization ◽

Uranium Atom ◽

Electron Impact Ionization ◽

Ionization Cross ◽

Direct Ionization ◽

Wide Range ◽

Ionization Cross Sections ◽

Theoretical Results

A theoretical model for electron impact ionization cross section has been found to be reliable for wide range of atoms is applied in this paper to the Uranium atom. A modified Kim binary encounter Bethe (BEB) method and modified Khare BEB method is employed for calculating electron impact ionization cross sections. The present results so obtained are compared with experimental as well as theoretical results known to the best of our knowledge.

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Electron-impact ionization and ionic fragmentation of O2 from threshold to 120 eV energy range

International Journal of Modern Physics B ◽

10.1142/s0217979221501046 ◽

2021 ◽

pp. 2150104

Author(s):

R. A. Lomsadze ◽

M. R. Gochitashvili ◽

R. Ya. Kezerashvili ◽

M. Schulz

Keyword(s):

Electron Impact ◽

Cross Sections ◽

Impact Ionization ◽

Theoretical Data ◽

Electron Impact Ionization ◽

Ion Source ◽

Fragment Ions ◽

Collision Chamber ◽

Product Ions ◽

Dissociative Processes

We study the electron-impact induced ionization of O2 from threshold to 120 eV using the electron spectroscopy method. Our approach is simple in concept and embodies the ion source with a collision chamber and a mass spectrometer with a quadruple filter as a selector for the product ions. The combination of these two devices makes it possible to unequivocally collect all energetic fragment ions formed in ionization and dissociative processes and to detect them with known efficiency. The ion source allows varying and tuning the electron-impact ionization energy and the target-gas pressure. We demonstrate that for obtaining reliable results of cross-sections for inelastic processes and determining mechanisms for the formation of O[Formula: see text]([Formula: see text]) ions, it is crucial to control the electron-impact energy for production of ion and the pressure in the ion source. A comparison of our results with other experimental and theoretical data shows good agreement and proves the validity of our approach.

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Electron Impact Ionization of Inert Gases

Canadian Journal of Physics ◽

10.1139/p74-232 ◽

1974 ◽

Vol 52 (18) ◽

pp. 1755-1758 ◽

Cited By ~ 5

Author(s):

S. P. Khare ◽

B. D. Padalia ◽

R. M. Nayak

Keyword(s):

Experimental Data ◽

Electron Impact ◽

Cross Sections ◽

Impact Energy ◽

Impact Ionization ◽

Electron Impact Ionization ◽

Inert Gases ◽

Ionization Cross ◽

Total Ionization ◽

Ionization Cross Sections

Electron impact total ionization cross sections of neon, argon, krypton, and xenon have been calculated for the electron impact energy varying from threshold to 20 keV. The method of Khare and Padalia, modified to include approximately the effect of multi-ionization, has been employed. The results are in fair agreement with the experimental data.

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