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-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.

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 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.

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