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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:32 |
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Conference: Bucharest University Faculty of Physics 2004 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
SOME REMARKS ON THE N2 SECOND POSITIVE BAND HEADS RELATIVE INTENSITIES BEHAVIOUR IN A CYLINDRICAL HOLLOW CATHODE DISCHARGE
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:
Due to the peculiarities of the topographical potential distribution and of the electron energy function distribution in the cylindrical hollow cathode plasma (there are two-three groups of different electron energies) placed in the range 1 – 50 eV depending of the physical conditions in the plasma electric discharge, we have the possibility to excite a great variety of atomic or molecular vibrational energy levels.
So in copper cylindrical cathode hollow effect discharge, in N2 gas pressure of 1 – 10 Torr, at 200 – 400 volts and current intensities placed in the range 0 – 250 mA, we have had the good conditions for whole 2+ band heads excitation. These were recorded with an experimental set-up consisting in a SPM-2 Zeiss 650 tr/mm grating monocromator coupled with an EMI – 9558 QB photomultiplier and a data acquisition system. We have had established some irregularities behaviour in the band heads intensity ratios and the excited vibrational density number, against the current intensities.
These irregularities can be correlated with some discordance between the intensities calculated for individual systems, in pure equilibrium conditions, and the real conditions in our hollow cathode electric discharge plasma.
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