Dissociative Electron-Ion Recombination: Product Determinations

Details Dissociative Electron-Ion Recombination: Product Determinations Dissociative Electron-Ion Recombination: Product Determinations

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..ses..da03a&link_type=abstract

American Physical Society, Southeastern Section Meeting, November 13-15, 1998 Miami, Florida, abstract #DA.03

Physics

Scientific paper

Electron-ion recombination, and to a lesser extent ion-ion reacombination, are the volume ionization loss processes in plasma media. These media can be as varied as interstellar gas clouds, planetary ionospheres, stellar envelopes, etchant plasmas, combustion flames and laser plasmas. Electron-ion recombination has been studied experimentally and theoretically for many years, mainly in terms of the overall rate coefficient. About 100 values have been determined experimentally, usually at 300K but with some ( ~10) as a function of temperature. Prior to 1985, almost nothing was known about the neutral products. Since that time, we have, in our laboratories, probed the neutral products spectroscopically (vuv to ir emission, vuv absorption, laser induced fluorescence). This has led to partial product distributions in most cases, but in the particular case of H_3O^+, a full product distribution was obtained. The techniques applied lend themselves to the determination of electronic and vibrational excitation in the products and this has allowed a detailed comparison with theory for a series of ions (HCO^+, N_2H^+, O_2H#^+, N_2OH^+, HCO_2^+ and H_3O^+). Most recently, the observations have been extended into the ir. Support is from NSF-AST-9415485.

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