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Please use this identifier to cite or link to this item: https://dspace.ffh.bg.ac.rs/handle/123456789/1298
Title: The influence of (n - n<sup>′</sup>)-mixing processes in He<sup>*</sup> (n) + He (1 s<sup>2</sup>) collisions on He<sup>*</sup> (n) atoms' populations in weakly ionized helium plasmas
Authors: Mihajlov, A. A.
Ignjatović, Ljubiša
Srećković, V. A.
Djurić, Z.
Keywords: Atomic and molecular collisions;Rydberg states
Issue Date: 1-Mar-2008
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer
Abstract: 
The results of semi-classical calculations of rate coefficients of (n - n′)-mixing processes due to collisions of Rydberg atoms He* (n) with He (1 s2) atoms are presented. It is assumed that these processes are caused by the resonant energy exchange within the electron component of He* (n) + He collision system. The method is realized through the numerical simulation of the (n - n′)-mixing processes, and is applied for calculations of the corresponding rate coefficients. The calculations are performed for the principal quantum numbers n, n′ in ranges 4 ≤ n < n′ ≤ 10, and the atom and electron temperatures, Ta, Te, in domains 5000 K ≤ Ta ≤ Te ≤ 20 000 K. It is shown that the (n - n′)-mixing processes can significantly influence the populations of Rydberg atoms in non-equilibrium weakly ionized helium plasmas with ionization degree ∼ 10- 4. Therefore, these processes have to be included in the appropriate models of such plasmas. © 2007 Elsevier Ltd. All rights reserved.
URI: https://dspace.ffh.bg.ac.rs/handle/123456789/1298
ISSN: 0022-4073
DOI: 10.1016/j.jqsrt.2007.09.005
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University of Belgrade
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University of Belgrade Faculty of Physical Chemistry