Ionization instability in CO2 laser discharges

1 June 1973

journal article
research article
Published by AIP Publishing in Applied Physics Letters

Vol. 22 (11) , 579-582
https://doi.org/10.1063/1.1654515

Abstract

Criteria are established for calculation of plasma conditions leading to ionization instability in plasmas generally employed in high‐power molecular laser applications. Negative ion formation is found to play an important role in causing this instability. For conditions typical of electrically excited CO₂ laser mixtures, appearance of an ionization instability requires a negative ion concentration greater than one‐tenth that of the electrons, combined with an electron temperature value below approximately 1.5 eV. Satisfactory agreement between theoretically determined stability boundaries and data obtained experimentally confirms the significance of fundamental collisional processes as regards ionization instability in CO₂ laser discharges.

Keywords

ELECTRON TEMPERATURE

This publication has 6 references indexed in Scilit:

Plasma chemistry of CO2 –N2 –He discharges
Applied Physics Letters, 1973
Electron Energy Distributions and Collision Rates in Electrically Excited $N_{2}$ , CO, and C $O_{2}$
Physical Review A, 1970
Moving Striations in the Argon Positive Column. I. Theory
Physics of Fluids, 1966
Total Cross Sections for Ionization and Attachment in Gases by Electron Impact. I. Positive Ionization
The Journal of Chemical Physics, 1965
Total Cross Sections for Ionization and Attachment in Gases by Electron Impact. II. Negative-Ion Formation
The Journal of Chemical Physics, 1965
Rotational Excitation and Momentum Transfer Cross Sections for Electrons in $H_{2}$ and $N_{2}$ from Transport Coefficients
Physical Review B, 1962