Electron impact ionization and excitation rate coefficients in the negative glow region of a glow discharge

2007 ◽  
Vol 103 (2) ◽  
pp. 260-271
Author(s):  
M.H. Elghazaly ◽  
S. Solyman
Keyword(s):  
Glow Discharge ◽  
Electron Impact ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Rate Coefficients ◽  
Negative Glow ◽  
Excitation Rate

Glow discharge electron impact ionization source for miniature mass spectrometers

2007 ◽  
Vol 42 (5) ◽  
pp. 675-680 ◽  
Author(s):  
Liang Gao ◽  
Qingyu Song ◽  
Robert J. Noll ◽  
Jason Duncan ◽  
R. Graham Cooks ◽  
...  
Keyword(s):  
Glow Discharge ◽  
Electron Impact ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Ionization Source ◽  
Mass Spectrometers ◽  
Miniature Mass Spectrometers ◽  
Electron Impact Ionization Source

scholarly journals Electron-impact ionization of Fe8+

2019 ◽  
Vol 624 ◽  
pp. A14 ◽  
Author(s):  
Aušra Kynienė ◽  
Sigitas Kučas ◽  
Šarūnas Masys ◽  
Valdas Jonauskas
Keyword(s):  
Electron Impact ◽  
Quantum Number ◽  
Cross Sections ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Rate Coefficients ◽  
Ionization Cross ◽  
Ionization Cross Sections ◽  
Best Fit ◽  
Extended Basis

Electron-impact ionization cross sections and Maxwellian rate coefficients are presented for the Fe8+ion by considering processes from the ground and metastable levels. The lifetimes of the levels for the 3s23p53d configuration were analysed using the extended basis of interacting configurations. Convergence of the cross sections for the indirect process due to excitations to the high-nlsubshells was investigated. We demonstrate that excitations to the subshells with orbital quantum numberl = 3 with subsequent autoionization dominate up to electron energies of ∼700 eV for the ground and metastable levels. Modelling of theoretical cross sections obtained for the ground and metastable levels to produce the best fit to the measurements shows that 15% of ions reach the reaction zone in the metastable state. The obtained results contradict the previous work that showed ∼30% for the metastable fraction.

Sign in / Sign up

Export Citation Format

Share Document