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Current of fermions scattered off a bubble wall.

Proceeding from WKB quantization conditions we derive a semiclassical expression for the current of fermions scattered off a propagating bubble wall in the presence of longitudinal gauge field. It agrees with the expression used by Nasser and Turok in a semiclassical analysis of the instability of electroweak bubble walls with respect to longitudinal {ital Z} condensation. We discuss the resulting dispersion relation for longitudinal {ital Z} field and show that light species are important for the analysis of stability because of their large contribution to plasma frequency.