Accession Number : AD0692307

Title :   HYDRATED POSITIVE IONS IN NITRIC OXIDE-WATER AFTERGLOWS,

Corporate Author : BALLISTIC RESEARCH LABS ABERDEEN PROVING GROUND MD

Personal Author(s) : Lineberger,William C. ; Puckett,Lawrence J.

Report Date : JUL 1969

Pagination or Media Count : 30

Abstract : Results of measurements performed on a stationary NO-H2O afterglow are reported in this paper. The gas mixture was contained in a large, gold-plated, cylindrical chamber in which the NO was ionized by means of krypton resonance radiation. The ions from the afterglow were sampled through an electrically insulated orifice and were quantitatively detected by time-resolved mass spectrometry. For NO(+) ions reacting in NO-H2O mixtures at 293 K, the product ion mass spectrum is dominated by NO(+) and its hydrates, NO(+).nH2O, and by hydrated-hydronium H3O(+).nH2O. The sequence of reactions leading to these products has been determined, and the rate constant for the three-body conversion of NO(+) to NO(+).H2O has been measured. Bounds for several other rate constants in the reaction sequence have been obtained. The ions H3O(+).2H2O, H3O(+).3H2O, and H3O(+).4H2O observed in the afterglow are of the same family as the hydronium ion H3O(+) and its hydrates H3O(+).H2O and H3O(+).2H2O, which are prominent in the D-region of the ionosphere. Reaction sequences similar to the one reported in this paper, which involve multiply hydrated atmospheric ions, may be an important contributor to the production of the hydrated-hydronium observed in the ionosphere. (Author)

Descriptors :   (*NITROGEN OXIDES, *AFTERGLOWS), (*UPPER ATMOSPHERE, NITROGEN OXIDES), GAS IONIZATION, MASS SPECTROSCOPY, MASS SPECTRA, HYDRATES, REACTION KINETICS, IONOSPHERE

Subject Categories : Atmospheric Physics
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE