scholarly journals Triply Differential Ionization Cross Sections of atomic and molecular targets by single electron impact

2018 ◽  
Vol 170 ◽  
pp. 01012
Author(s):  
Lena Mouawad ◽  
Ziad El Bitar ◽  
Ahmad Osman ◽  
Mohamad Khalil ◽  
Paul Antoine Hervieux ◽  
...  
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Theoretical Data ◽  
Differential Cross Sections ◽  
General Shape ◽  
Ionization Cross ◽  
Ionization Cross Sections ◽  
Theoretical Results ◽  
Acceptable Agreement ◽  
Good Agreement

We present numerically calculated triply differential cross sections for the simple ionization of two targets, atomic hydrogen and ammonia, in the First Born Approximation framework with one Coulomb wave describing the ejected electron. The partial wave series of the wavefunctions centered around the same origin were used and the intial state molecular wavefunction was derived using information provided by Gaussian03 software for ammonia. The theoretical results are calculated in the geometrical settings and kinematical conditions of previous experiments and are compared to published experimental and theoretical data. The results show good agreement with previous studies based on the same model for hydrogen. The general shape of the triply differential cross sections obtained for ammonia are in acceptable agreement with experimental data in the binary region but not in the recoil region where our simple framework fails to reconstruct the recoil peaks.

scholarly journals Electron-Collision-Induced Dissociative Ionization Cross Sections for Silane

2009 ◽  
Vol 2009 ◽  
pp. 1-9 ◽  
Author(s):  
Satyendra Pal ◽  
Neeraj Kumar ◽  
Anshu
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Theoretical Data ◽  
Ionization Rate ◽  
Dissociative Ionization ◽  
Rate Coefficients ◽  
Electron Collision ◽  
Differential Cross Sections ◽  
Ionization Cross ◽  
Ionization Cross Sections

Secondary electron energy and angle dependent differential cross sections for the production of cations SiHn+ (n=0–3), H2+ and H+ resulting from dissociative ionization of SiH4by electron collision have been evaluated at fixed incident electron energies of 100 and 200 eV. The semiempirical formulation of Jain and Khare which requires the oscillator strength data as a major input has been employed. In the absence of experimental data for differential cross sections, the corresponding derived integral partial and total ionization cross sections in the energy range varying from ionization threshold to 1000 eV revealed a satisfactory agreement with the available experimental and theoretical data. We have also evaluated the ionization rate coefficients on the basis of calculated partial ionization cross sections and Maxwell-Boltzmann energy distributions.

Experiments with low-energy electrons scattered by polarized, excited sodium

1996 ◽  
Vol 74 (11-12) ◽  
pp. 991-996 ◽  
Author(s):  
L. Vušković
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Threshold Energy ◽  
Electron Collision ◽  
Differential Cross Sections ◽  
Ionization Cross ◽  
Total Ionization ◽  
Low Energy Electrons ◽  
Superelastic Scattering ◽  
Ionization Cross Sections

Several crossed-beam experiments were performed to acquire information concerning collisions of low-impact-energy electrons with ground-state or laser-excited sodium atoms prepared in 32P3/2, F = 3 (MF = +3 or −3) polarized states. Results of these experiments are the azimuthal asymmetry of the differential cross sections between two polarized states in the elastic electron collision (3P → 3P) at selected scattering angles, absolute differential cross sections for elastic, inelastic, and superelastic scattering obtained with no normalization procedure involved, and total ionization cross sections in the threshold energy range.

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.

Angular distributions of the 12C(e,p)e′ reaction at Ee = 200 MeV

1981 ◽  
Vol 59 (2) ◽  
pp. 271-274 ◽  
Author(s):  
G. J. Lolos ◽  
S. Hontzeas ◽  
R. M. Sealock
Keyword(s):  
Electron Energy ◽  
Cross Sections ◽  
Differential Cross ◽  
Proton Energy ◽  
Incident Electron ◽  
Incident Electron Energy ◽  
Angular Distributions ◽  
Differential Cross Sections ◽  
Good Agreement

Double differential cross sections at six angles ranging from 45° to 143° have been measured for the 12C(e,p)e′ reaction. The proton energy ranged from 15.6 to 17.2 MeV at an incident electron energy of 200 MeV. At the backward angles our results are in good agreement with data reported by Vysotskaya and Afanas'ev but for forward angles the results are lower.

scholarly journals Direct and Dissociative Ionization Cross Section of Oxygen Molecule from Threshold to 10 KeV

2019 ◽  
Vol 8 (6S3) ◽  
pp. 1365-1368
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Ionization Cross Section ◽  
Threshold Energy ◽  
Theoretical Data ◽  
Oxygen Molecule ◽  
Dissociative Ionization ◽  
Ionization Cross ◽  
Section Data ◽  
Ionization Cross Sections

Due to abundant applications of ionization in various fields of applied sciences, it’s desirable to calculate absolute ionization cross sections of various atoms or molecules. In this literature, we have calculated the absolute direct and dissociative ionization cross sections of the oxygen molecule from threshold energy to 10,000 eV by using revisited Jain-Khare semi-empirical approach. In this literature, the total direct and absolute ionization cross section data have compared with easily available experimental and/or theoretical data. The present results give a better account for the ionization cross sections up to higher incident electron energies.

scholarly journals Electron Scattering from the Ground and Excited States of Barium

1999 ◽  
Vol 52 (3) ◽  
pp. 603
Author(s):  
Dmitry V. Fursa
Keyword(s):  
Excited States ◽  
Electron Scattering ◽  
Cross Sections ◽  
Differential Cross ◽  
Ground State ◽  
Differential Cross Sections ◽  
Close Coupling ◽  
Angular Correlations ◽  
Electron Photon ◽  
Good Agreement

We have used the nonrelativistic convergent close-coupling (CCC) method to investigate electron scattering from the ground (6s2)1S state and excited (6s6p)1 Po1 and (6s5d)1,3De2 states of barium. For the scattering from the barium ground state, we have found very good agreement with measurements of (6s6p)1 Po1 apparent cross sections at all energies. Similarly, good agreement is found for differential cross sections for elastic scattering and (6s6p)1 Po and (6s5d)1 De2 excitations and with the (6s6p)1 Po1 state electron{photon angular correlations. For the scattering from excited states of barium we have found good agreement with elastic (6s6p)1 Po1 scattering and the (6s5d)1De2 → (6s6p)1 Po1 transition for both differential cross sections and electron–photon angular correlations.

scholarly journals Calculations of Electron Loss to Continuum in Collisions of Li- and Be-Like Uranium Ions with Nitrogen Targets

Atoms ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 89
Author(s):  
Andrey I. Bondarev ◽  
Yury S. Kozhedub ◽  
Ilya I. Tupitsyn ◽  
Vladimir M. Shabaev ◽  
Günter Plunien
Keyword(s):  
Perturbation Theory ◽  
Energy Distribution ◽  
Cross Sections ◽  
Differential Cross ◽  
Differential Cross Sections ◽  
Electron Loss ◽  
First Order ◽  
Uranium Ions ◽  
Relativistic Perturbation Theory ◽  
Good Agreement

Doubly differential cross sections for projectile ionization in fast collisions of few-electron uranium ions with the nitrogen target are calculated within the first order of the relativistic perturbation theory. A comparison with the recent measurements of the energy distribution of forward-emitted electrons is made and good agreement is found.

Electron Impact Ionization Cross Sections of N2 and O2

1975 ◽  
Vol 53 (11) ◽  
pp. 1044-1046 ◽  
Author(s):  
Suresh Chandra ◽  
Udit Narain
Keyword(s):  
Experimental Data ◽  
Energy Range ◽  
Electron Impact ◽  
Cross Sections ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Ionization Cross ◽  
Ionization Cross Sections ◽  
Good Agreement

The ionization cross sections of N2 and O2 have been calculated in the energy range from threshold to 20 keV using a modified approach. The results are in good agreement with the available experimental data.

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