The relative intensities of spectral lines from Δ n = 0 transitions in 2 p 5 3 l configurations of neon-like Ar 8+ and Cl 7+ are measured in a plasma generated with a θ -pinch device. Six of these lines involving 3 p -3 s transitions have exhibited significant amplification in high density plasmas of higher- Z elements, but with considerable disagreement compared to numerical predictions. Agreement in the present experiment indicated that the collisional excitation, mixing, and radiative decay in the modeling is accurate, at least for the ions measured. Data supporting this on 3 d -3 p as well as 3 d -2 p and 3 s -2 p transitions are presented. The emphasis here is on the measurements performed. For example, an essential instrumental relative intensity calibration by a branching ratio technique is described in detail.
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Elton et al. (1990) studied this question.
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