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1 Aug 2002

Volume 92, Issue 3, pp. 1181-1720

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Negative differential resistance related to self-organization phenomena in a dc gas discharge

E. Lozneanu, V. Popescu, and M. Sanduloviciu

J. Appl. Phys. 92, 1195 (2002); http://dx.doi.org/10.1063/1.1490156 (5 pages) | Cited 10 times

Online Publication Date: 18 July 2002

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Oscillations stimulated by an S-shaped negative differential resistance originating from the self-assembly and decay of a self-organized space charge configuration in front of the anode of a dc gas discharge were observed. The oscillations appear in a resonant circuit, appropriate for the discharge, which contains a capacitor having a plate charged by secondary electron emission. The plate can be a metallic or a dielectric one because the negative differential resistance operates at zero dc current to the plate. © 2002 American Institute of Physics.
Show PACS
52.80.Hc Glow; corona
52.35.Fp Electrostatic waves and oscillations (e.g., ion-acoustic waves)

Electron energy deposition in an electron-beam pumped KrF amplifier: Impact of the gas composition

J. L. Giuliani, G. M. Petrov, and A. Dasgupta

J. Appl. Phys. 92, 1200 (2002); http://dx.doi.org/10.1063/1.1491592 (7 pages) | Cited 7 times

Online Publication Date: 18 July 2002

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Calculations for electron deposition in electron beam generated KrF laser at atmospheric pressure have been performed. The impact of the Ar/Kr/F2 gas mixture on the electron energy distribution function, electron density, and mean energy, energy per electron–ion pair, attachment, dissociation, excitation, and ionization rates have been investigated. The F2 abundance controls the low energy (≲9 eV) component of the distribution function, while both the fluorine and krypton mole fraction affect the distribution in the midenergy domain (9 to ∼25 eV). Consequently, the F2 attachment rate coefficient varies with the F2 mole fraction (xF2) such that the electron density scales as 1/xF20.7. The rate coefficient for direct dissociation of F2 is smaller than for attachment but the former contributes more to the total power dissipation (∼8% at xF2=0.01). The excitation-to-ionization ratio for Kr is not constant, as generally assumed, but increases by a factor of two with a decrease in either the Kr or F2 abundance. Combining the former and present investigations leads to a set of fitting formulas to be used in beam kinetics codes for various collision rates as a function of both the electron beam power density and the composition. © 2002 American Institute of Physics.
Show PACS
42.55.Lt Gas lasers including excimer and metal-vapor lasers
42.60.By Design of specific laser systems
42.55.Ah General laser theory
34.80.Gs Molecular excitation and ionization
34.80.Ht Dissociation and dissociative attachment
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
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