Dielectronic Recombination in He-like, Li-like and Be-like Iodine and KLM Resonances
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Dielectronic Recombination in He-like, Li-like and Be-like Iodine
and KLM Resonances
Erdi A. Bleda†, Ay¸se Yumak∗, Ilhan Yavuz ∗, and Zikri Altun∗ 1
∗Department of Physics, University of Marmara, 34722, Ziverbey, Istanbul, TURKEY
†Department of Mathematic and Computer, AREL University, Tepekent, Istanbul, TURKEY
SynopsisDR rate coefficients for He-like, Li-like and Be-like Iodine ions and KLM resonances are calculated using MCBP approximation.
Dielectronic recombination (DR) rate coeffi-cients are needed for determining both the level populations and the ionization balance of plas-mas over a wide range of electron temperatures and densities and plasma timescales. Reliable DR coefficients are essential for the spectral di-agnosis of non-equilibrium laboratory and astro-physical plasmas. Here we present DR rate coef-ficients for highly charged Iodine ions in the He-like, Li-He-like, and Be-like electron configurations. Calculations were performed both for the ground and metastable initial states within the multi-configuration Breit-Pauli (MCBP) approxima-tions using kappa-averaged relativistic wavefunc-tions including mass-velocity and Darwin oper-ators in the solution of the radial equations as implemented in the AUTOSTRUCTURE code [1]. Slater-Type orbital model potential to rep-resent the Coulomb interactions between pairs of electrons is used for the calculations of radial or-bitals. Both ∆n = 0 and ∆n = 1 core excitations involving 1s and 2s subshells were included. The dielectronic capture process to nl Rydberg levels is assumed to take place explicitly with n and l values ranging between 0-6 and 2-25, respec-tively, for ∆n = 0 core excitations. For the case of ∆n = 1 core excitations n values are explic-itly included upto 15. An approximation for the highlevel values of n was used up to n = 1000 in either cases. Calculations embrace a wide range of electron temperature range (104
− 10 10
)K. AUTOSTRUCTURE produces raw autoioniza-tion and radiative rates which are post-processed to obtain the final-state level-resolved and total DR rate coefficients. Maxwellian-averaged total DR rate coefficients are shown in Figure 1 a. Res-onances in Fig. 1 b, c and d result from the au-toionizations of 1s2l3l′, 1s2s2l3l′, and 1s2s2
2l3l′ configurations associated with the ∆n = 1 core transitions during the capture of electrons by
He-like, Like-like and Be-like Iodine ions, respec-tively, with l=0-1 and l′=0-2.
25000 26000 27000 28000 29000 30000 0,0 0,6 1,2 0,2 0,5 0,1 0,4 0,7 25000 25200 25400 25600 25800 0,0 0,2 0,4 0,6 0,8 25000 25200 25400 25600 0,0 0,2 0,4 0,6 24800 25000 25200 25400 25600 25800 0,0 0,5 1,0 10 4 10 6 10 8 10 10 10 -16 10 -14 10 -12 10 -10 10 -8
Center of Mass Energy (eV) He-like I D R R a t e C o e f f i ci e n t s ( 1 0 -1 0 cm 3 sn -1 ) Li-like I Be-like I (d) (c) (b) (a) R a t e C o e f f i ci e n t ( cm 3 sn -1 ) Temprature (K) He-like I Li-like I Be-like I
Figure 2. Maxwellian-average rate coefficients for He-like, Li-like, and Be-like Iodine ions(a). (b)-(d) show the resonances resulting from the
autoionza-tions of the 1s2l3l′, 1s2s2l3l′, and 1s2s22l3l′for
He-like, Li-He-like, and Be-like Iodine ions, respectively.
References
[1] Badnell, N. R., and Pindzola, M. S. 1989, Phys. Rev. A, 39, 1685; Badnell, N. R. 1992, Phys. Rev. A, 46, 660.
1E-mail: zikalt@marmara.edu.tr
XXVII International Conference on Photonic, Electronic and Atomic Collisions (ICPEAC 2011) IOP Publishing Journal of Physics: Conference Series 388 (2012) 062038 doi:10.1088/1742-6596/388/6/062038
