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

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.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1986
Accession Number
ADA187291

Entities

People

  • John A. Vanderhoff
  • Philip M. Donmoyer
  • Steven W. Bunte

Organizations

  • Ballistic Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Absorption Spectra
  • Chemistry
  • Classification
  • Decomposition
  • Engineering
  • Environment
  • Frequency Shift
  • Jet Propulsion
  • Laser Induced Fluorescence
  • Liquid Propellants
  • Mechanical Engineering
  • Military Research
  • Molecules
  • Propellants
  • Raman Spectra
  • Spectra
  • Weapons

Readers

  • Materials Science and Engineering.

Technology Areas

  • AI & ML
  • Directed Energy
  • Directed Energy - Lasers