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Applied Physics Letters / Volume 95 / Issue 5 / PLASMAS AND ELECTRICAL DISCHARGES

Appl. Phys. Lett. 95, 051501 (2009); http://dx.doi.org/10.1063/1.3177314 (3 pages)

Observation and quantification of OH radicals in the far downstream part of an atmospheric microwave plasma jet using cavity ringdown spectroscopy

Chuji Wang1, Nimisha Srivastava1, and Theodore S. Dibble2

1Department of Physics and Astronomy and the Institute for Clean Energy Technology, Mississippi State University, Starkville, Mississippi 39762, USA
2Department of Chemistry, State University of New York College of Environmental Science and Forestry, Syracuse, New York 13210, USA

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(Received 31 March 2009; accepted 12 June 2009; published online 3 August 2009)

An atmospheric argon microwave plasma jet with a plasma column 8 mm long and 1–2 mm wide is studied. Existence of hydroxyl (OH) radicals down to 28 mm away from the plasma orifice is evidenced by UV cavity ringdown spectroscopy. The measured OH (v″ = 0, J″ = 3.5) number density at 28 mm is 7.2×1012 molecule/cm3. The plasma gas flow velocity, along with the known OH lifetimes, suggests that OH radicals observed in the downstream are not the OH radicals formed in the plasma column but were formed in the downstream.

© 2009 American Institute of Physics

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KEYWORDS and PACS

Keywords

free radicals, oxygen compounds, plasma jets, radiative lifetimes

PACS

  • 52.20.Hv

    Atomic, molecular, ion, and heavy-particle collisions

  • 52.75.-d

    Plasma devices

  • 33.70.Ca

    Oscillator and band strengths, lifetimes, transition moments, and Franck-Condon factors

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3177314

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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