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Proceedings Paper

Laser-Initiated Reaction Of Phosphine And Nitrogen Fluorides
Author(s): Joseph K McDonald; Roger W Jones
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Paper Abstract

The reaction of phosphine and nitrogen trifluoride initiated by a CW CO2 laser has produced several interesting results. Mixtures that are rich in phosphine produced a brownish polymeric film, along with phosphorus trifluoride, hydrogen fluoride, and nitrogen. The infrared spectra of the polymer indicated that N-H, P=N, and P-F vibrational bands were present. It was observed that when hydrogen bonded NH vibrational bands were present in the IR, the polymeric film was slightly conductive. The film could also be made to be conductive by doping with iodine vapors. The polymer film was observed to decompose slowly when exposed to air due to hydrolysis. A visible emission is observed when the phosphine and nitrogen trifluoride mixtures are irradiated. Spectral analysis of this fluorescence showed that the discrete spectra was due to PF, CN, atomic Na, and CaF. Most of the fluorescence was the result of a continuum that extended across the visible into the near infrared. The emission was observed to give simple exponential decay to oscillations with spikes as the nitrogen trifluoride to phosphine ratio was increased. The oscillations have been shown to be due to the shock waves generated by the reaction traversing the cell. The reaction cell was fitted with Brewster angle windows and placed in a hole-coupled cavity to determine if lasing could be obtained. Some gain has been observed from 400 to 800 nm. A comparison of the laser-induced emission to the emission from the phosphine/nitrogen trifluoride flame has also been made.

Paper Details

Date Published: 25 November 1986
PDF: 6 pages
Proc. SPIE 0669, Laser Applications in Chemistry, (25 November 1986); doi: 10.1117/12.938940
Show Author Affiliations
Joseph K McDonald, U.S. Army Missile Command (United States)
Roger W Jones, University of Alabama (United States)

Published in SPIE Proceedings Vol. 0669:
Laser Applications in Chemistry
D. K. Evans, Editor(s)

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