  A soliton model for proton conductivity in Langmuir films is presented. The
model contains three real scalar fields describing the hydrogen involved in the
conduction, the hydrophilic head of the Langmuir film, and the water. Soliton
solutions that describe proton motion along the hydrogen bonds are found. Under
compression of the film, the distance between the minima of the proton
potential and the strength of the hydrogen bonds between the film molecule and
the water are changed. Such changes increase the probability of soliton
creation. The model presented allows proton conductivity data in Langmuir films
to be explained.
