K. "Moribayashi

T." Kato

National Institute for Fusion Science (NIFS-Repository)

§ 10. Dielectronic Recombination of Be-like Fe I on Moribayashi, K., Kato, T. We have been studying the dielectronic recombination of the ions in order to understand the phenomena in the high temperature plasma such as tokamak and solar plasmas. In this paper, we treat the dielectronic recombination through the 2pnl and 31nl' excited states of Fe22+ ion. In dielectronic recombination, two processes, dielectronic capture process and radiative transition process exist, that is, Here A +z-1 * * express the autoioniza.tion state of A +z-1 ion. Then dielectronic recombination rate coefficient (a) is representedby a=gAaAr/(l:Aa+l:Ar) (2) where A a and Ar represent autoioniza.tion rate and radiative transition probability. The aims of this study are (i) to estimate a for each final states and (ii) to understand the atomic nuclear dependence for Aa, Ar, and a by comparing with those for C2+ ion.[l] In the case of C2 + ion, the a values through 2 the 1s 3lnl'states are always smaller than those through the 1s22pnl ones[l]. On the other hand, in the Fe22+ ion, the a values through the 1 s22pnl states and those through the 1 s23lnl' states dominate at low and high temperature, respectively (see Fig 1). We understand the reason from atomic nuclear dependence. Finally we calculate the a values for the final excited 1 s22snl and 1 s22pnl (n=2"'-J 10) states. These values provide us the population of each excited state by a collisional radiative model. However, there are few paper which gives us enough these data as long as we know. - present(total)-+- present(1s22pnl) -o- total(1s231nl')- Romanik ··-·-·· Roszman, * Mc&Hahn; 10000 Fig. 1 a as a function of Te. References [1]U.I. Safronova, T.Kato, and M.Ohira, NISF-DATA-3 7(1996). [2 ]K. Moribayashi and T. Kato, i NIFS-DATA-36(1996). [3 ]K. Moribayashi and T. Kato, Physica Scripta, in press. 285 

Dielectronic Recombination of Be-like Fe Ion

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