  The influence of the electromagnetic irradiation pressure on a spheroidal
metallic nanoparticle at the frequencies close to the surface plasmon
vibrations has been considered. With the action of the radiation pressure, the
polarizability of metal nanoparticle becomes a tensor quantity. The expressions
for the resonance pressure components for the cases of plane-polarized and
circularly polarized light have been derived. We have demonstrated that the
resonance pressure can substantially depend on the shape of a non-spherical
nanoparticle and its orientation with respect to the direction of light
propagation and the light polarization.
