Si. Bastrukov, LOW-FREQUENCY ELASTIC RESPONSE OF A SPHERICAL-PARTICLE, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 49(4), 1994, pp. 3166-3170
A continuum approach is discussed to describe the low-frequency respon
se of a small spherical particle under laser irradiation. This respons
e is interpreted in terms of essentially long-wavelength normal vibrat
ions of a perfectly elastic globe. The eigenfrequencies of spheroidal
and torsional oscillations are derived as functions of the particle ra
dius R and multipole degree 1. The frequencies of spheroidal vibration
s are found to be omega(s) = omega0 [2(21 + 1)(l - 1)]1/2; the eigenmo
des of torsional oscillations are given by omega(t) = omega0 [(2l + 3)
(l - 1)]1/2, with omega0(2) = mu/(rho0R2), where mu and rho0 are the s
hear modulus and the bulk density, respectively. The obtained results
may be tested on spherical clusters with R approximately 100-200 k, ir
radiated by infrared laser light with the wavelength lambda approximat
ely 5000 angstrom.