Electrostatic surface waves in a dusty plasma

Electromagnetic dispersion relation of a surface wave is obtained propagating on an interface between a vacuum and a dusty plasma, which consists of electrons and ions on their respective Boltzmann distributions and cold dust particles providing the inertia of the plasma and carrying a certain portion of the negative charge of the plasma. The electrostatic spectrum is interesting, since the branch of the high frequency electron wave is of an acoustic type whose frequency range is confined to 0.5⩽ω/ωpe<1 (ωpe is the electron plasma frequency). The low frequency ion surface wave resembles the volume dust acoustic wave and may be called a dust acoustic surface wave.