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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 17:58 |
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Conference: Bucharest University Faculty of Physics 2009 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Local Rotational and Vibrational Temperatures
in a RF Nitrogen Plasma Jet
Authors:
M. Bazavan1, T. Acsente2, S.D. Stoica2, B. Mitu2, G. Dinescu2
Affiliation:
1University of Bucharest, Faculty of Physics PO Box MG 11, 077125 Măgurele, Romania
2National Institute for Laser, Plasma and Radiation Physics,
PO Box MG 36, 077125, Magurele, Bucharest, Romania
E-mail
m_bazavan@yahoo.com
Keywords:
Abel inversion, nitrogen RF plasma jet, rotational and vibrational temperatures
Abstract:
In the present paper the radial distribution of rotational and vibrational temperatures in a nitrogen radiofrequency (RF) plasma jet working at low pressure has been determined. The spectra recorded with spatial resolution have been Abel inverted by an analytical method, which implies the fitting of spatial distribution of intensity with a Gaussian profile and the Abel inversion of it. The temperatures have been calculated by comparing the Abel inverted spectra with the simulated spectra in the wavelength range 360 – 381 nm, corresponding to Δv=-2 sequence of the N2 Second Positive System C 3Π – B 3Π (SPS). The radial temperature distributions have been studied and compared at different nitrogen flows (1000 -2000 sccm) and different applied RF powers (150 -250 W). On the symmetry axis of the plasma jet, the rotational temperatures were around 900 – 1000 K, while the vibrational temperatures were ranging from 9000 to 10500 K. The values have been correlated with plasma generation conditions.
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