Abstract
The level 2s2p2(4P) of OIV is a metastable state and the line intensity Ii (2p3(4S) − 2s2p2(4P)) is mainly generated by the excitation from the metastable state 2s2p2(4P) to 2p3(4S). Then the line intensity ratio is Ii to the resonance line intensity Ir (2s2p2(2D) − 2s22p(2P)) has a dependence on electron density until the metastable level is saturated. The ratio Ii/Ir obtained from the measurements of JIPPT-IIU Tokamak plasmas has Been analyzed. It is found that the recombination from a metastable state of OV 2s2p(3P) to the metastable state of OIV 2s2p2(4P) is appreciable in high temperature plasmas where the abundance of OV is larger than that of OIV. The recombination rate coefficient between metastable states is determined from-the line intensity ratios; I(2p2(3P) − 2s2p(3P))/I(2s2p(1P) − 2s2(1S)) of OV, (2s2p2(2D) − 2s22p(2P)) and Ii/Ir of OIV. This recombination process consists of dielectronic recombination and radiative recombination.
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