Optical and Quantum Electronics

, Volume 14, Issue 6, pp 501–513 | Cite as

Ion aging effects on the dissociative-attachment instability in CO2 lasers

  • R. E. BeverlyIII
Papers

Abstract

Onset of the dissociative-attachment instability requires that the rate coefficient for electron detachment (kd) from negative ions be below a critical value. The predominant negative and positive ions in a CO2∶N2∶He gas-discharge plasma are known to change with time. As secondary by-products form and the predominant negative-ion species changes from CO3 to NO2, a decrease inkd occurs destabilizing the discharge. Since NO2 and NO3 are largely unreactive with respect to associative detachment,kd depends in a sensitive fashion on the concentration of certain minority negative ions (O, O2) and neutrals (CO, O, N). The sufficient conditions for the dissociative-attachment instability are much less sensitive to changes in the electron-ion and ion-ion recombination rate coefficients resulting from the ion aging process.

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Copyright information

© Chapman and Hall Ltd. 1982

Authors and Affiliations

  • R. E. BeverlyIII
    • 1
  1. 1.ColumbusUSA

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