Abstract
The influence of ionic contamination of a commercial ferroelectric liquid crystal on the dynamic behaviour of the smectic C layer reorientation was investigated with respect to its dependence on electric field asymmetry, amplitude, frequency and temperature. It is shown that ions within the liquid crystal sample greatly enhance the smectic layer reorientation at low frequencies. Especially the frequency dependence of the layer reorientation is discussed in some detail. In the framework of a qualitative interpretation the contribution of ionic motion causing a convective flow accounts for the smectic layer reorientation behaviour observed.
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