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Proceedings Paper

Spectral analysis of cavity chemiluminescence of a combustion-driven HF laser fueled by NF3
Author(s): Liucheng Li; Liping Duo; Yuanhu Wang; Shukai Tang; Haijun Yu; Guofu Li; Jian Wang
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Paper Abstract

The visible and near infrared spectra of cavity chemiluminescence of a combustion driven HF laser fueled by NF3 were collected and analyzed. The spectral line at 529 nm for the green chemiluminescence was attributed to electronic excited NF molecules in b1∑ state, i.e. NF(b). The diffuse bands from 570 nm to 700 nm were attributed to the N2(B-A) emission. The spectral lines from 850 nm to 1000 nm were attributed to the HF Δυ = 3 emission bands. At the end of every experiment, the spectral line at 874 nm would be observed, which was attributed to the electronic excited NF molecules in a1 Δ state, i.e. NF(a). The NF(a-X) emission was found experimentally to be always avoiding the HFΔυ = 3 emission bands. It was also found experimentally that the NF(b-X) emission always accompanied the HF Δυ = 3 emission bands and their emission intensities had the same trends as a function of experimental time. Whereas the NF(a) molecules was produced in the optical cavity directly by the reaction of H atoms with NF2 molecules in the incomplete combustion effluents, the NF(b) molecules were suggested to be produced mainly by the near resonant energy transfer from vibrational excited HF(v<=2) molecules to NF(a) molecules. In other words, the vibrational excited state HF(v<=2) molecules can be efficiently deactivated by the NF(a) molecules by near resonant V-E energy transfer process. Therefore we concluded that incomplete dissociation of NF3 might be harmful to the HF(v<=2) population.

Paper Details

Date Published: 3 February 2015
PDF: 8 pages
Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 92552E (3 February 2015); doi: 10.1117/12.2065285
Show Author Affiliations
Liucheng Li, Dalian Institute of Chemical Physics (China)
Liping Duo, Dalian Institute of Chemical Physics (China)
Yuanhu Wang, Dalian Institute of Chemical Physics (China)
Shukai Tang, Dalian Institute of Chemical Physics (China)
Haijun Yu, Dalian Institute of Chemical Physics (China)
Guofu Li, Dalian Institute of Chemical Physics (China)
Jian Wang, Dalian Institute of Chemical Physics (China)


Published in SPIE Proceedings Vol. 9255:
XX International Symposium on High-Power Laser Systems and Applications 2014
Chun Tang; Shu Chen; Xiaolin Tang, Editor(s)

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