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 4×1017cm3 for time delays of 2.1 to 0.4μs after laser-induced optical breakdown. In methane flow, recombination molecular spectra of the Δν=+2 progression of the C2 Swan system are discernable in the Hβ and Hγ plasma emissions within the first few microseconds. The recorded atomic spectra indicate the occurrence of hydrogen self-absorption for pulsed CH4 flow pressures of 2.7×105Pa (25psig) and 6.5×105Pa (80psig).

© 2008 Optical Society of America

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