Abstract

We report time-resolved imaging of a laser-ablated carbon plasma plume to investigate the expansion dynamics of C2 and CN in an ambient atmosphere of nitrogen gas at various pressures. An attempt is made to locate C2 and CN species in the carbon plasma plume and correlate them with the results of spectroscopic observations. The ablated C2 and CN species decelerate due to collisions with nitrogen gas and are localized in the slower part (300ns) of the expanding plume. Further expansion (<700ns) of the plasma reveals the concentration of C2 species on the periphery of the plume, whereas CN dominates at the core of the plume. However, at times greater than 700ns, the collisions and recombination processes dominate in the plume and C2 expands slower than CN. The plume dynamics is studied in terms of shock-wave and drag models.

© 2008 Optical Society of America

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