Accession Number : ADA187291

Title :   Laser Raman Studies Related to Liquid Propellants: Structural Characteristics Inferred from the Nitrate Anion Spectra.

Descriptive Note : Final rept. Jun-Sep 86,

Corporate Author : ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Vanderhoff, John A ; Bunte, Steven W ; Donmoyer, Philip M

PDF Url : ADA187291

Report Date : Sep 1986

Pagination or Media Count : 32

Abstract : Experimental Raman studies on aqueous hydroxylammonium nitrate (HAN) show concentration dependent center frequency and linewidth changes of the Nitrate vibrations which are similar to the aqueous alkali-metal nitrates; but not ammonium nitrate. Comparison of Raman spectra for HAN and silver nitrate dissolved in both water and acetonitrile demonstrate there is no substantial contact-ion pairing for aqueous HAN solutions at concentrations around 0.2 M. Markedly decreased linewidths and band splittings occur when HAN is solidified. The center frequency of the Raman bands have been observed to be temperature dependent. From -50 C to 22 C, the nu4 band center frequency decreases by about 4/cm; however, no discernible temperature dependent asymmetries were detected. A laser induced fluorescence signal originating from some impurity has been observed during the course of these experiments on aqueous HAN. This impurity has a broad, structureless, visible absorption spectrum and test are negative for being of microbe origin. Keywords: Laser raman spectroscopy, Nitrate anion, Liquid propellants.

Descriptors :   *AMMONIUM NITRATE, *ANIONS, *LIQUID PROPELLANTS, ABSORPTION SPECTRA, ACETONITRILE, ALKALI METALS, ASYMMETRY, BANDS(STRIPS), COMPARISON, EXPERIMENTAL DATA, FREQUENCY, HYDROXYL RADICALS, IMPURITIES, LASER BEAMS, LASER INDUCED FLUORESCENCE, LASERS, LIGHT SCATTERING, LIQUIDS, MICROORGANISMS, NITRATES, RAMAN SPECTRA, RAMAN SPECTROSCOPY, SILVER COMPOUNDS, SPECTRA, STRUCTURAL PROPERTIES, TEMPERATURE, VIBRATION, VISIBLE SPECTRA, WATER

Subject Categories : Liquid Rocket Propellants
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE