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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 50,
  • Issue 5,
  • pp. 614-618
  • (1996)

Fiber-Optic Raman Detection of Trace Levels of Phosphonate Vapors Chemisorbed onto an Alumina Substrate

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Abstract

Detection of ppm(v) levels of the nerve agent simulants dimethyl methylphosphonate (DMMP) and diisopropyl methylphosphonate (DIMP) by chemisorption to an alumina surface followed by fiber-optic Raman spectroscopic determination is described. Real-time measurements of the increase in the Raman line intensities with respect to time for DMMP and DIMP chemisorption to alumina are presented. A detection limit at the 95% confidence interval of 6 ppm(v) is calculated for DMMP vapors at a vapor flow rate of I00 mL/min. Factors which limit lower detection limits are identified and possible solutions presented.

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