Electron Impact Double Ionization of Noble Gas Atoms

1972 ◽  
Vol 50 (23) ◽  
pp. 2961-2966 ◽  
Author(s):  
B. N. Roy ◽  
D. N. Tripathi ◽  
D. K. Rai
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Noble Gas ◽  
Double Ionization ◽  
Experimental Results ◽  
Ionization Cross ◽  
Proton Impact ◽  
Classical Expression ◽  
Ionization Cross Sections

Cross sections for double ionization by electron impact for noble gas atoms have been calculated using Gryzinski's classical expression. The effect of including ionization from the inner shell has been discussed in connection with possible Auger emission. Calculated cross sections have been compared with the available experimental results and also with calculated values of proton impact double ionization cross sections.

scholarly journals Electron-impact double ionization of the carbon atom

2018 ◽  
Vol 620 ◽  
pp. A188 ◽  
Author(s):  
Valdas Jonauskas
Keyword(s):  
Carbon Atom ◽  
Electron Impact ◽  
Cross Sections ◽  
Double Ionization ◽  
Impact Excitation ◽  
Rate Coefficients ◽  
Electron Impact Excitation ◽  
Ionization Cross ◽  
Ionization Cross Sections ◽  
Good Agreement

Electron-impact single- and double-ionization cross sections and Maxwellian rate coefficients are presented for the carbon atom. Scaling factors are introduced for the electron-impact excitation and ionization cross sections obtained in the distorted wave (DW) approximation. It is shown that the scaled DW cross sections provide good agreement with measurements for the single ionization of the C atom and C1+ ion. The direct double-ionization (DDI) process is studied using a multi-step approach. Ionization–ionization, excitation–ionization–ionization, and ionization–excitation–ionization branches are analyzed. It is demonstrated that the three-step processes contribute ≼40% of the total DDI cross sections for the case where one of the electrons takes all of the excess energy after the first ionization process.

scholarly journals The Electron Impact Ionization Cross Sections of Methanol, Ethanol and 1-Propanol

Atoms ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 60 ◽  
Author(s):  
Yogesh Kumar ◽  
Manoj Kumar ◽  
Sachin Kumar ◽  
Rajeev Kumar
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Impact Ionization ◽  
Experimental Results ◽  
Oscillator Strengths ◽  
Ionization Cross ◽  
Total Ionization ◽  
Plane Wave Born Approximation ◽  
Ionization Cross Sections ◽  
Good Agreement

In the present investigation, the plane-wave Born approximation was employed to calculate the total ionization cross sections by electron impact of methanol, ethanol and 1-propanol from the threshold of ionization to 10 MeV. This method requires continuum generalized oscillator strengths (CGOSs). The two different semi-phenomenological expressions of CGOS, given by Mayol and Salvat and Weizsacker and Williams, along with approximated form of the continuum optical oscillator strength (COOS) by Khare et al. were used. Furthermore, the average of the above two CGOSs was also used. The calculated ionization cross sections were compared to the available previous theoretical results and experimental data. Out of three CGOSs, the present results with the average CGOS were found in good agreement with the available experimental results for all the considered molecules. Collision parameters CRP were also calculated from 0.1 to 100 MeV and the calculations were found to be in excellent agreement with the experimental results of Reike and Prepejchal.

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.

Binary encounter calculations on electron impact double ionization of noble gas atoms

1978 ◽  
Vol 56 (9) ◽  
pp. 1255-1260 ◽  
Author(s):  
A. Kumar ◽  
B. N. Roy
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Noble Gas ◽  
Double Ionization ◽  
Distribution Functions ◽  
Hartree Fock ◽  
Velocity Distribution Functions ◽  
Ionization Cross Sections ◽  
Binary Encounter Approximation ◽  
Binary Encounter

Electron impact double ionization cross sections of noble gas atoms have been calculated in the binary encounter approximation by using Gryzinski's double binary encounter model. The correct expression for σΔE including exchange and interference as given by Vriens has been used. Hartree–Fock and hydrogenic velocity distribution functions have been used in considering the ejection of the first and the second atomic electron, respectively. Contribution of ionization from inner-shell has also been taken into account. Calculated values of cross sections are found to be in agreement with the experimental observations.

Electron-impact double-ionization cross sections forXe8+

1989 ◽  
Vol 39 (5) ◽  
pp. 2381-2384 ◽  
Author(s):  
D. W. Mueller ◽  
L. J. Wang ◽  
D. C. Gregory
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Double Ionization ◽  
Ionization Cross ◽  
Ionization Cross Sections
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