Chemical Production of Excited NF.
Abstract
The a singlet delta and b singlet sigma(+) states of NF, NCl and NBr can be efficiently generated by reactions of F+HN3 followed by halogen atom reactions with the azide radical, N3. Scalability of these systems is sensitive to the buildup of N3 concentrations since N3+N3 reactions undermine the overall efficiency. Large concentrations of N3 are encountered when the halogen atom reaction with N3 is significantly slower than its formation step, F+HN3. Hence scaling of NF (a singlet delta) is not feasible, but that of NCl(b singlet sigma(+)) and NBr(b singlet sigma(+)) shows promise. A diagnostic tool sensitive to optical gains or absorptions of less than 0.000002 per cm. was developed. In the NCl flame, the medium was transparent everywhere to the diagnostic probe, indicating fast removal of NCl(singlet sigma(+)) by reactions with Cl and/or F atoms which are present in large excess. Strong absorptions were observed in the NBr flame in accord with an expected short radiative lifetime of the singlet sigma(+) state. Energy transfer from NF(singlet sigma(+)) to atomic Bi generating the 6(doublet)D(3/2) metastable state proceeds at gas kinetic rates. Using a single frequency CW dye laser, the first high resolution spectrum Bi 6(quadruplet)S3/2-6(doublet)D(3/2) was measured, and the radiative lifetime of the 6(doublet)D(3/2) state determined. Although an NF-Bi gain experiment was not performed, the appropriate diagnostic system was demonstrated. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1982
- Accession Number
- ADA118017
Entities
People
- A. T. Pritt Jr.
- Damini Patel
- F. J. Wodarczyk
- R. D. Coombe