Quantum Mechanical Calculation of Maximum Electron Impact Single Ionization Cross Sections for the Inert Gases and Small Molecules

1996 ◽  
Vol 100 (37) ◽  
pp. 15021-15026 ◽  
Author(s):  
Claire Vallance ◽  
Peter W. Harland ◽  
Robert G. A. R. Maclagan
Keyword(s):  
Small Molecules ◽  
Electron Impact ◽  
Cross Sections ◽  
Quantum Mechanical Calculation ◽  
Inert Gases ◽  
Quantum Mechanical ◽  
Ionization Cross ◽  
Mechanical Calculation ◽  
Single Ionization ◽  
Ionization Cross Sections

Detailed investigation of electron-impact single-ionization cross sections and plasma rate coefficients of N-shell tin ions

2013 ◽  
Vol 46 (17) ◽  
pp. 175201 ◽  
Author(s):  
A Borovik ◽  
M F Gharaibeh ◽  
P M Hillenbrand ◽  
S Schippers ◽  
A Müller
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Rate Coefficients ◽  
Ionization Cross ◽  
Single Ionization ◽  
Ionization Cross Sections

Calculations of electron-impact single-ionization cross sections of helium isoelectronic systems

2004 ◽  
Vol 70 (3) ◽  
Author(s):  
M. A. Uddin ◽  
M. A. K. Fazlul Haque ◽  
A. K. Basak ◽  
B. C. Saha
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Ionization Cross ◽  
Single Ionization ◽  
Ionization Cross Sections

Cross Section Ratios for the Electron Impact Production of Singly and Multiply Ionized Rare Gas Ions

1978 ◽  
Vol 33 (9) ◽  
pp. 1111-1113 ◽  
Author(s):  
F. Egger ◽  
T. D. Mark
Keyword(s):  
Electron Impact ◽  
Cross Section ◽  
Mass Spectrometer ◽  
Cross Sections ◽  
Impact Ionization ◽  
Rare Gas ◽  
Ionization Cross ◽  
Single Ionization ◽  
Multiple Ionization ◽  
Ionization Cross Sections

Electron impact ionization of He, Ne, Ar, Kr and Xe has been studied with a double focussing mass spectrometer Varian MAT CH5. Ratios of various multiple ionization cross sections with respect to single ionization cross sections for He, Ne, Ar, Kr and Xe at electron energies of 50, 100 and 150eV are given. These cross section ratios are com­pared with previous determinations.

Measurement of electron-impact single-ionization cross sections ofAr8+

1991 ◽  
Vol 44 (7) ◽  
pp. 4368-4371 ◽  
Author(s):  
Y. Zhang ◽  
C. B. Reddy ◽  
R. S. Smith ◽  
D. E. Golden ◽  
D. W. Mueller ◽  
...  
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Ionization Cross ◽  
Single Ionization ◽  
Ionization Cross Sections

Electron-impact single ionization cross sections of helium isoelectronic systems

2004 ◽  
Vol 100 (2) ◽  
pp. 184-198 ◽  
Author(s):  
M. Alfaz Uddin ◽  
A. K. Basak ◽  
B. C. Saha
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Ionization Cross ◽  
Single Ionization ◽  
Ionization Cross Sections

Electron impact single ionization cross sections of $$\hbox {W}^{\mathrm {{+}}}$$

2021 ◽  
Vol 75 (8) ◽  
Author(s):  
G. Purohit ◽  
D. Kato ◽  
I. Murakami ◽  
K. C. Dhakar ◽  
S. Gupta ◽  
...  
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Ionization Cross ◽  
Single Ionization ◽  
Ionization Cross Sections

scholarly journals Relativistic electron impact ionization cross sections of carbon ions and application to an optically thin plasma

2019 ◽  
Vol 631 ◽  
pp. A42 ◽  
Author(s):  
Miguel A. de Avillez ◽  
Mauro Guerra ◽  
José Paulo Santos ◽  
Dieter Breitschwerdt
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Quantum Mechanical ◽  
Carbon Ions ◽  
Ionization Cross ◽  
Mechanical Methods ◽  
Ionization Cross Sections ◽  
Thin Plasma

Context. Ionization through electron impact is a fundamental process associated with the evolution of the ionic structure and emissivity of astrophysical plasmas. Over several decades substantial efforts have been made to measure and calculate the ionization cross sections of ionization through electron impact of different ions shell by shell, in particular, of carbon ions. Spectral emission codes use electron-impact ionization cross sections and/or rates taken from different experimental and theoretical sources. The theoretical cross sections are determined numerically and include a diversity of quantum mechanical methods. The electron-impact ionization database therefore is not uniform in the methods, which makes it hard to determine the reason for the deviations with regard to experimental data. In many cases only total ionization rates for Maxwell–Boltzmann plasmas are available, which makes calculating inner-shell ionization in collisional-radiative models using thermal and nonthermal electron distribution functions difficult. A solution of this problem is the capability of generating the cross sections with an analytical method using the minimum number of atomic parameters. In this way, uniformity in the database is guaranteed, and thus deviations from experiments are easily identified and traced to the root of the method. Aims. The modified relativistic binary encounter Bethe (MRBEB) method is such a simple analytical scheme based on one atomic parameter that allows determining electron-impact ionization cross sections. This work aims the determination of K- and L-shell cross sections of the carbon atom and ions using the MRBEB method and show their quality by: (i) comparing them with those obtained with the general ionization processes in the presence of electrons and radiation (GIPPER) code and the flexible atomic code (FAC), and (ii) determining their effects on the ionic structure and cooling of an optically thin plasma. Methods. The MRBEB method was used to calculate the inner-shells cross sections, while the plasma calculations were carried out with the collisional+photo ionization plasma emission software (CPIPES). The mathematical methods used in this work comprise a modified version of the double-exponential over a semi-finite interval method for numerical integrations, Gauss-elimination method with scaled partial pivoting for the solution of systems of linear equations, and an iterative least-squares method to determine the fits of ionization cross sections. Results. The three sets of cross sections show deviations among each other in different energy regions. The largest deviations occur near and in the peak maximum. Ion fractions and plasma emissivities of an optically thin plasma that evolves under collisional ionization equilibrium, derived using each set of cross sections, show deviations that decrease with increase in temperature and ionization degree. In spite of these differences, the calculations using the three sets of cross sections agree overall. Conclusions. A simple model like the MRBEB is capable of providing cross sections similar to those calculated with more sophisticated quantum mechanical methods in the GIPPER and FAC codes.

Electron Impact Ionization of Inert Gases

1974 ◽  
Vol 52 (18) ◽  
pp. 1755-1758 ◽  
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.

Ionization Cross Sections by Electron Impact for Single Ionization from the Atomic Ground State

2014 ◽  
Vol 998-999 ◽  
pp. 140-143
Author(s):  
Yan Hua Li
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Experimental Results ◽  
Ionization Cross ◽  
Single Ionization ◽  
Atomic Ground State ◽  
Fine Structures ◽  
Section Curve ◽  
Ionization Cross Sections ◽  
Almost All

Using the empirical formula with three free parameters recently proposed, ionization cross sections are given for the representation of cross sections for single ionization of free atoms from the ground stages by electron impact. Almost all experimental results can be approximated by this formula with 20% over the whole energy range between the threshold and 1 . All experimental results can be approximated with experimental error. The formula proposed is not suitable to regenerate the exact contour of fine structure in the ionization cross section curve. The probable error is estimated to be approximately 20%, but the error is larger than 40% and no fine structures are accounted for near the threshold.

Effect of orthogonalization on total ionization cross sections by electron impact: application to small molecules

2015 ◽  
Vol 69 (3) ◽  
Author(s):  
Samra Nehaoua ◽  
Salim Houamer ◽  
Claude Dal Cappello ◽  
Mehdi Chinoune ◽  
Alexander Galstyan ◽  
...  
Keyword(s):  
Small Molecules ◽  
Electron Impact ◽  
Cross Sections ◽  
Ionization Cross ◽  
Total Ionization ◽  
Ionization Cross Sections
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