Excitation of the Resonance Lines of Ar by Electrons

1973 ◽  
Vol 51 (9) ◽  
pp. 914-921 ◽  
Author(s):  
J. W. McConkey ◽  
F. G. Donaldson
Keyword(s):  
Energy Range ◽  
Electron Impact ◽  
Oscillator Strength ◽  
Cross Sections ◽  
Experimental Results ◽  
Impact Excitation ◽  
Electron Impact Excitation

'Polarization-free' measurements are presented of the electron impact excitation of the 1048 Å and 1067 Å resonance lines of argon in the energy range 10–2000 eV. Cross sections are made absolute by normalizing to the optical oscillator strength of the 1048 Å line. Cascade is shown to play a major role in the excitation of the 4s levels. Comparison is made with other experimental results and with theory where available.

scholarly journals The effect of exchange and absorption potential in the distorted wave calculation of electron impact excitation of the autoionizing state of caesium

2020 ◽  
Vol 1 (1) ◽  
pp. 39-46
Author(s):  
A. A. Ochieng ◽  
J Okumu ◽  
C S Singh
Keyword(s):  
Energy Range ◽  
Electron Impact ◽  
Cross Sections ◽  
Intermediate Energy ◽  
Impact Excitation ◽  
Experimental Result ◽  
Electron Impact Excitation ◽  
Distorted Wave ◽  
Autoionizing State ◽  
Absorption Potential

We have calculated the differential and integral cross sections for electron impact excitation of the lowest autoionizing level of caesium atoms in the energy range 13 – 500 eV using the distorted wave method. In this study we have used a complex distortion potential as the distortion potential both at the initial and the final channels. Our results are compared amongst themselves to establish the effect of exchange and imaginary absorption potentials. We also compared with other available theoretical and experimental results to determine the suitability of our present method. From the results it is seen that when an absorption potential is included in the distortion potential, the integral cross section moves closer to the experimental result in the intermediate energy range 19 – 40 eV.

Integral cross sections for electron-impact excitation of the 33S and 31S states of He near threshold

2006 ◽  
Vol 39 (6) ◽  
pp. 1547-1561 ◽  
Author(s):  
M Stepanović ◽  
M Minić ◽  
D Cvejanović ◽  
J Jureta ◽  
J Kurepa ◽  
...  
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Near Threshold

Benchmark cross sections for electron-impact excitation ofn S1levels of He

1980 ◽  
Vol 22 (5) ◽  
pp. 1916-1929 ◽  
Author(s):  
B. Van Zyl ◽  
G. H. Dunn ◽  
G. Chamberlain ◽  
D. W. O. Heddle
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Impact Excitation ◽  
Electron Impact Excitation

Electron impact excitation of positive ions

1970 ◽  
Vol 266 (1175) ◽  
pp. 225-279 ◽  
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Nuclear Charge ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Positive Ions ◽  
Relativistic Coulomb ◽  
Hydrogenic Ions

Non-relativistic Coulomb-Born-Oppenheimer reactance matrices and cross-sections are given for all transitions between the Is, 2s and 2p states in He+ and in hydrogen-like ions of large nuclear charge. From these results some cross-sections for intercombination transitions in highly charged non-hydrogenic ions are estimated.

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.

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