Accession Number : ADA188462

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 : ADA188462

Report Date : Aug 1987

Pagination or Media Count : 33

Abstract : Experimental Raman studies on aqueous hydroxylammonium nitrate (HAN) show concentration dependent center frequency and linewidth changes of the NO3 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 an 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 tests are negative for being of microbe origin. Keywords: Laser Raman spectroscopy, Nitrate anion, Liquid propellants.

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

Subject Categories : Ammunition and Explosives
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE