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 for time delays of 2.1 to after laser-induced optical breakdown. In methane flow, recombination molecular spectra of the progression of the Swan system are discernable in the and plasma emissions within the first few microseconds. The recorded atomic spectra indicate the occurrence of hydrogen self-absorption for pulsed flow pressures of () and ().
© 2008 Optical Society of America
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