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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:07 |
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Conference: Bucharest University Faculty of Physics 2005 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
ROTATIONAL TEMPERATURES IN THE CYLINDRICAL HOLLOW CATHODE DISCHARGE NITROGEN PLASM
Authors:
M.Bazavan, O. Toma, I. Iova
Affiliation:
Bucharest University, Faculty of Physics, P.O. Box MG-11, Bucharest – Magurele, RO – 077125
E-mail
Keywords:
Abstract:
A very important issue in the fundamental scientific research connected with numerous practical applications is the determination of the plasma temperatures.
In the nonequilibrium plasma, only the local thermodynamic equilibrium (L.T.E.) plasma have a practical importance. In the molecular plasma, a high importance problem in the laser physics and astrophysics concerns the rotation temperatures determination.
In particular, the rotation temperature for the cylindrical hollow cathode effect nitrogen plasma is determined using the rotation structure for the resonant band v’ = 0 ® v’’ = 0 of the nitrogen molecule N22+ “first negative” system.
The studied plasma was obtained in a cylindrical hollow cathode effect plasma in molecular nitrogen with gas pressure of 1 – 10 Torr, at 0 – 400 volts and current intensities placed in the range 0 – 250 mA. The obtained spectra were recorded with an experimental set-up consisting in a SPM-2 Zeiss 600 tr/mm grating monocromator coupled with an EMI – 9558 QB photomultiplier and a data acquisition system.
In order to compensate the absence of the high resolution for the rotation spectra toward the band heads, multiple interpolations between the real and the simulated spectra were searched, at different temperatures anf for different discharge currents. For these currents, plausible temperatures were obtained (between 600 – 900 K) and their dependence upon the discharge currents were also represented.
These results have an important practical impact in the laser physics and in the plasmo-chemistry.
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