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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: G65–G71

Dynamics of laser-ablated carbon plasma: formation of C 2 and CN

Archana Kushwaha and R. K. Thareja  »View Author Affiliations


Applied Optics, Vol. 47, Issue 31, pp. G65-G71 (2008)
http://dx.doi.org/10.1364/AO.47.000G65


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Abstract

We report time-resolved imaging of a laser-ablated carbon plasma plume to investigate the expansion dynamics of C 2 and CN in an ambient atmosphere of nitrogen gas at various pressures. An attempt is made to locate C 2 and CN species in the carbon plasma plume and correlate them with the results of spectroscopic observations. The ablated C 2 and CN species decelerate due to collisions with nitrogen gas and are localized in the slower part ( 300 ns ) of the expanding plume. Further expansion ( < 700 ns ) of the plasma reveals the concentration of C 2 species on the periphery of the plume, whereas CN dominates at the core of the plume. However, at times greater than 700 ns , the collisions and recombination processes dominate in the plume and C 2 expands slower than CN. The plume dynamics is studied in terms of shock-wave and drag models.

© 2008 Optical Society of America

OCIS Codes
(170.6920) Medical optics and biotechnology : Time-resolved imaging
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(280.5395) Remote sensing and sensors : Plasma diagnostics

History
Original Manuscript: November 20, 2007
Revised Manuscript: July 14, 2008
Manuscript Accepted: July 17, 2008
Published: September 1, 2008

Citation
Archana Kushwaha and R. K. Thareja, "Dynamics of laser-ablated carbon plasma: formation of C2 and CN," Appl. Opt. 47, G65-G71 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-31-G65


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