Spectral output from a premixed chain reaction cw HF laser

Spectral measurements of the output from a purely chemical chain reaction cw HF laser are reported. The laser is a subsonic H2-F2 flame, with supersonic premixing and spatially uniform initiation by a stationary normal shock. Initial chemical production of fluorine atoms is by the bimolecular reacti...

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Veröffentlicht in:J. Appl. Phys.; (United States) 1980-07, Vol.51 (7), p.3536-3540
Hauptverfasser: Stanton, Alan C., Bien, Fritz
Format: Artikel
Sprache:eng
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Zusammenfassung:Spectral measurements of the output from a purely chemical chain reaction cw HF laser are reported. The laser is a subsonic H2-F2 flame, with supersonic premixing and spatially uniform initiation by a stationary normal shock. Initial chemical production of fluorine atoms is by the bimolecular reaction of F2 with NO. Spectral measurements of the laser output near the initiating shock indicate lasing transitions in the P branches of the v=3 → v=2, v=2 → v=1, and v=1 → v=0 HF bands. Further downstream, the upper vibrational levels are strongly deactivated, and lasing occurs only in the v=1 → v=0 band. Laser emission in the v=2 → v=1 band reappears at reduced NO flow rates, suggesting efficient deactivation of HF (v) by NO, possibly through multiquantum V-V exchange. An approximate rate of 5×10−13±0.5 cm3/sec for deactivation of HF (v=2) by NO is inferred.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.328191