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

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Abstract

Onset of the dissociative-attachment instability requires that the rate coefficient for electron detachment (k d) 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 CO −3 to NO −2 , a decrease ink d occurs destabilizing the discharge. Since NO −2 and NO −3 are largely unreactive with respect to associative detachment,k d depends in a sensitive fashion on the concentration of certain minority negative ions (O−, O −2 ) 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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    R. E. Beverly III

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Beverly, R.E. Ion aging effects on the dissociative-attachment instability in CO2 lasers. Opt Quant Electron 14, 501–513 (1982). https://doi.org/10.1007/BF00610306

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