SPECTROSCOPIC DIAGNOSIS IN ELECTRONIC TEMPERATURE OF PHOTOIONISE PLASMAS

• Main Authors: A. K. Ferouani, M. K. Inal
• Format: Article
• Language: English
• Published: El Oued University 2015-08-01
• Series: Journal of Fundamental and Applied Sciences
• Subjects: Strongly charged ions, lines emission, radiative and dielectronic recombination.
• Online Access: http://jfas.info/index.php/jfas/article/view/194

<p>In this work, we are interested in the diagnostics in electronic temperature of a plasma purely photoionized, based on the intensity ration of lines emitted by ions helium-like, which have an atomic number <em>Z </em>relatively small. We considered the three lines corresponding to the transitions starting from the excited levels 1s<em>2l</em> towards the fundamental level 1s^{2 1}S₀, like appropriate lines. More precisely, the line of resonance w<em> </em>due to the transition 1s2p ¹P₁ --- 1s² ¹S₀, the line of intercombinaison (x,y) 1s2p ³P_2,1--- 1s² ¹S₀  as well as prohibited line z<em> </em>due to the transition 1s² ³S₁ --- 1s2 ¹S₀. These lines appear clearly in the spectra of astrophysical plasmas. As helium-like ion, we chose two, the oxygen O⁶⁺ (Z=8) and neon Ne⁸⁺(Z=10). We carried out calculations of the ration of lines intensity G=(z+x+y)/w<em> </em>of O⁶⁺ and Ne⁸⁺according to the electronic temperature in the range going from 10⁵ to 10⁷ K. We will see that, like it was shown by Gabriel and Jordan in 1969 [1], this intensity ration can be very sensitive to the temperature electronic and practically independent of the electronic density. Consequently, the ration G<em> </em>can be used to determine in a reliable way the electronic temperature of plasma observed [2].<em></em></p>