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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 31 — Nov. 1, 2008
  • pp: G1–G6

Time-resolved spectroscopy measurements of hydrogen-alpha, -beta, and -gamma emissions

Christian G. Parigger, Matthew Dackman, and James O. Hornkohl  »View Author Affiliations


Applied Optics, Vol. 47, Issue 31, pp. G1-G6 (2008)
http://dx.doi.org/10.1364/AO.47.0000G1


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Abstract

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 4 × 10 17 cm 3 for time delays of 2.1 to 0.4 μs after laser-induced optical breakdown. In methane flow, recombination molecular spectra of the Δ ν = + 2 progression of the C 2 Swan system are discernable in the H β and H γ plasma emissions within the first few microseconds. The recorded atomic spectra indicate the occurrence of hydrogen self-absorption for pulsed CH 4 flow pressures of 2.7 × 10 5 Pa ( 25 psig ) and 6.5 × 10 5 Pa ( 80 psig ).

© 2008 Optical Society of America

OCIS Codes
(020.3690) Atomic and molecular physics : Line shapes and shifts
(140.3440) Lasers and laser optics : Laser-induced breakdown
(300.6210) Spectroscopy : Spectroscopy, atomic
(300.6390) Spectroscopy : Spectroscopy, molecular
(350.5400) Other areas of optics : Plasmas

History
Original Manuscript: April 2, 2008
Manuscript Accepted: May 28, 2008
Published: July 16, 2008

Citation
Christian G. Parigger, Matthew Dackman, and James O. Hornkohl, "Time-resolved spectroscopy measurements of hydrogen-alpha, -beta, and -gamma emissions," Appl. Opt. 47, G1-G6 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-31-G1


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References

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