Stark Profile Measurement of the He II 4686 A Line in a High Density Plasma

抄録

Using a Z-pinch plasma as a source, Stark broadened profile of the He II 4686 A line has been measured and compared with Stark broadening theories. The electron density has been obtained from best fit profiles of the He I 3889 A line to the theory. The electron density range is 1.9–3.7×10¹⁷ cm⁻³. The electron temperature has been determined from the intensity ratio of the He II 4686 A and the He I 3889 A lines, yielding ∼5×10⁴ K. The experimental profiles stand between the calculated profiles of Greene and of Kepple. The discrepancy between the experiments and the theories is briefly discussed in relation to the neglected effect of the ion motion in the calculation of the hydrogen and the hydrogenic ion line profiles.