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The M-effect in A.C/D.C. discharges in He+O2/ Cl2 gas mixtures

G. MUSA1, L. C. CIOBOTARU1,* , BARBU IONUT2

Affiliation

  1. National Institute R&D for Laser, Plasma and Radiation Physics, PO Box MG 36, 077125, Bucharest, Romania
  2. Faculty of Physics, University of Bucharest, Romania

Abstract

In a number of previously published papers we reported the possibility of obtaining nearly monochrome radiation spectra using discharges in electronegative-electropositive gas mixtures at pressures in the range 10 –100 torr. This effect of radiation monochromatisation was called by us the M-effect and was related to the heavy particle inelastic collisions. In order to characterize this effect we introduced the M parameter defined as the ratio of the relative intensities of the radiation of two wavelengths of recorded spectra, where one is called dominant radiation, having a spectacular growing at the addition of the electronegative gas and the other one is a common radiation chosen from the spectrum, which is considered the reference line. Using this parameter, various recorded spectra can be compared and thus, the M value will be a measure of the M-effect “intensity”. Recorded spectra of a narrow gap (0.15 mm) PDP type discharge in a range of 10-300 Torr in pure He and in (He+O2/ Cl2) gas mixtures in A.C and in a D.C. discharge, in this case using an original device, in the same range of pressures and with similar gas mixtures, are presented in this paper. A dramatic change of spectra can be observed..

Keywords

M-effect, Electronegative-electropositive mixtures gas, Spectral shift, Quenching processes.

Submitted at: March 10, 2006
Accepted at: May 18, 2006

Citation

G. MUSA, L. C. CIOBOTARU, BARBU IONUT, The M-effect in A.C/D.C. discharges in He+O2/ Cl2 gas mixtures, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 3, pp. 1292-1297 (2006)