Electron impact ionization cross sections of hydrogen fluoride molecule

2019 ◽  
Vol 26 (3) ◽  
pp. 195-203
Author(s):  
Rajeev Kumar ◽  
SP Sharma ◽  
Ravinder Sharma
Keyword(s):  
Hydrogen Fluoride ◽  
Cross Sections ◽  
Impact Ionization ◽  
Theoretical Data ◽  
High Energy ◽  
Primary Electron ◽  
Ionization Cross ◽  
Total Ionization ◽  
Semiempirical Approach ◽  
Ionization Cross Sections

Partial and total ionization cross sections of hydrogen fluoride molecule are determined from the ionization threshold to high energy (5 KeV) by using a modified Jain–Khare semiempirical approach. Partial single and double differential cross sections with their sums (total) through direct and dissociative ionization have been also evaluated at fixed primary electron energies 100 eV, 200 eV, and 500 eV. There is no other data for partial ionization cross sections and differential ionization cross sections for comparison. In this paper, the total ionization cross sections data have compared with available experimental data and/or with other theoretical data which are available from intermediate to high energy. It is found that the present result gives a better account for the ionization cross sections up to higher energies.

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 by protons in the energy range 100 to 450 keV

1963 ◽  
Vol 274 (1358) ◽  
pp. 365-370 ◽  
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Cross Sections ◽  
Ionization Cross Section ◽  
Axial Magnetic Field ◽  
High Energy ◽  
Ionization Cross ◽  
Total Ionization ◽  
Ion Production ◽  
Ionization Cross Sections

Ionization by protons in the energy range 100 to 450 keV has been investigated by means of the well-known parallel-plate condenser method. A uniform axial magnetic field enables slow ion collection to be carried out over a precisely determined path length at pressures low enough to ensure single collision conditions. The total cross-section for slow ion production cr+, and the total ionization cross-section have been determined for protons in hydrogen, helium , neon, argon and krypton. It is found that charge transfer is very small above about 200 keV so that cr+ ~ cr e . The ionization cross-section for all cases falls off as E -1 log E where E is the energy of relative motion. At the high-energy limit of the present measurements, the proton ionization cross-sections agree closely with electron ionization cross-sections for the same relative velocity of impact. The results are therefore in agreement with the general predictions of the Born approximation.

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.

scholarly journals Electron-Impact Ionization of Heavy Atoms Using the Time-Dependent Close-Coupling Method

Atoms ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 32
Author(s):  
Michael S. Pindzola ◽  
Stuart D. Loch ◽  
James P. Colgan
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Impact Ionization ◽  
Coupling Method ◽  
Time Dependent ◽  
Ionization Cross ◽  
Close Coupling ◽  
Direct Ionization ◽  
Total Ionization ◽  
Ionization Cross Sections

The time-dependent close-coupling method has been recently applied to calculate electron-impact direct ionization cross sections for the Kr, W, and Pb atoms. An overview is presented for these three heavy neutral atom systems. When the direct ionization cross sections are combined with excitation-autoionization cross sections, the total ionization cross sections were found to be in reasonable agreement with crossed-beams measurements for Kr and Pb.

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