NDLI: Determination of OH Radicals in an Atmospheric Pressure Helium Microwave Plasma Jet

Content Provider	IEEE Xplore Digital Library
Author	Srivastava, N. Chuji Wang
Copyright Year	1973
Abstract	A recent study has reported the observation of the OH radicals in the far downstream of an atmospheric argon microwave plasma jet. The far downstream is referred to as the location where the ratio of the distance from the jet orifice to the length of the jet column is greater than three. In this paper, we report that this phenomenon also exists in a similar plasma jet that is 2.5 mm long, operated in helium gas. A detailed characterization of the helium microwave plasma jet was carried out by using UV-pulsed cavity ringdown spectroscopy and optical emission spectroscopy. The absolute number densities of the OH radicals were measured along the plasma jet column from the jet orifice to the far downstream, and the OH concentrations vary from 9.64 × 10¹⁵ near the jet orifice to 7.32 × 10¹² molecules/cm³ in the far downstream (16 mm away from the jet orifice, corresponding to a distance ratio of 6.4). The dependence of the OH concentration on plasma power and gas flow rate at different locations along the jet axis is characterized, and the result suggests that the OH concentration increases with an increase in plasma power and gas flow rate in the downstream.
Sponsorship	IEEE Nuclear and Plasma Sciences Society
Starting Page	918
Ending Page	924
Page Count	7
File Size	450416
File Format	PDF
ISSN	00933813
Volume Number	39
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Helium Plasma temperature Laser beams Temperature measurement Plasma measurements Cavity resonators OH radicals Atmospheric microwave plasma jet cavity ringdown spectroscopy (CRDS) far downstream helium plasma jet number density
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Condensed Matter Physics

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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