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The central structure of the Stark-broadened Balmer line Hbeta has been analysed in the plasma produced behind the reflected shock in a combustion-driven shock tube of internal diameter 10 cm. The incident shock is propagated at a Mach number typically of M=8 in a mixture of 0.5% H2(D2), 80% Ne, 20% He (Ar) at an initial pressure of 10 Torr creating in the reflected-shock region temperatures close to 104K and electron number densities 1016<Ne<1017. Measuring times are 150 mu s. The variation of centre dip with reduced mass which has now been measured in two widely differing plasma sources strongly suggests that the discrepancy between theory and experiment for the central structure of Hbeta is due to ion dynamical effects.

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