Rate Constants for the Reaction of PO (v = 0) and PO (v = 1) Radicals with Oxygen

Abstract

Laser-induced fluorescence (LIF) has been used to probe vibrational state population of PO radicals generated by Carbondioxide2 photolysis of dimethyl methylphosphonate. PO radicals in vibrational levels up to v = 3 have been detected. The population ratio determined for v = 0 and v = 1 is consistent with a vibrational temperature of 1000 k. LIP monitoring of the decay of PO radicals in the presence of an excess of oxygen has allowed determination of the rate constants for reaction of PO (v = 0) and PO (v = 1) with o2. The measured rate constants for both these reactions are 1.5 x 10 to the -11 power cc / molecule/s or about 1/25 the hard-sphere collision rate. Potential laser photofragmentation/LIF detection schemes for organophosphonates should accordingly incorporate no more than 10 ns between photolysis and probing for PO radicals. Keywords: Laser photofragmentation.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1989
Accession Number
ADA206799

Entities

People

  • S. R. Long
  • Steven D. Christesen

Organizations

  • Edgewood Chemical Biological Center

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Carbon Dioxide Lasers
  • Chemical Reaction Properties
  • Chemical Reactions
  • Classification
  • Collisions
  • Detection
  • Dissociation
  • Dye Lasers
  • Engineering
  • Ionization
  • Laser Beams
  • Laser Induced Fluorescence
  • Lasers
  • Measurement
  • Molecules
  • Organophosphorus Compounds
  • Photolysis

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Molecular Photonics/Laser Physics

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers