Elastic-Surface-Wave Scattering from Point-Mass Defects in a Solid Surface

Scattering of elastic surface waves from static mass defects in a solid surface is investigated by means of field-theoretical scattering theory. All modes of elastic surface waves constructing an orthonormal complete set are involved to calculate the scattering cross sections as functions of frequency for incident Rayleigh-mode waves. It is shown that those cross sections except ${\sigma }_{R\to \mathrm{SH}}$ reveal the characteristic resonance structure in the frequency region $\omega \simeq \mathrm{}(0.5-4.0)\mathrm{}\times {10}^{13}$ ${\sec }^{-1\mathrm{}}$. The author also finds that the rescattering effects significantly enhance the scattering into other Rayleigh-mode waves.