DYNAMIC TRANSPORT ON HUMID SILICA SURFACE .1.

The frequency dependence of dynamic transport of charge on silica rods at 97% relative humidity is presented in the frequency range 10(-2) t o 10(5) Hz, with the spacing s between painted metal electrodes and th e rod diameter d as parameters. The response is strongly dispersive an d shows an unusual frequency dependence which is interpreted in terms of an equivalent circuit. The dependence on s and on d suggests the do mination by fractional power-law processes arising from non-uniform su rface flow.