Time-resolved spectroscopy measurements of hydrogen-alpha, -beta, and -gamma emissions
Hydrogen emission spectroscopy results are reported following laser-induced optical breakdown with infrared Nd:YAG laser radiation focused into a pulsed methane flow. Measurements of Stark-broadened atomic hydrogen-alpha, -beta, and -gamma lines show electron number densities of 0.3 to 4x10{sup 17} cm{sup -3} for time delays of 2.1 to 0.4 {mu}s after laser-induced optical breakdown. In methane flow, recombination molecular spectra of the {delta}{nu}=+2 progression of the C2 Swan system are discernable in the H{beta} and H{gamma} plasma emissions within the first few microseconds. The recorded atomic spectra indicate the occurrence of hydrogen self-absorption for pulsed CH4 flow pressures of 2.7x10{sup 5} Pa (25 psig) and 6.5x10{sup 5} Pa (80 psig)
- OSTI ID:
- 21175723
- Journal Information:
- Applied Optics, Journal Name: Applied Optics Journal Issue: 31 Vol. 47; ISSN 0003-6935; ISSN APOPAI
- Country of Publication:
- United States
- Language:
- English
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