Abstract
Assuming that the interparticle distance is greater than the wavelength of the incident light, we show that double-scattering effects are important for the fundamental mode of vibration as well as for the second-harmonic mode of vibration for resonance scattering (a = a>0) of electromagnetic waves by a system of bound electrons of natural frequencym0. At resonance, for a slab of 1 cm thickness, double-scattering effects would be comparable to single-scattering effects even for low density of electrons such as n ∼ 109/cm3. The angular distribution of the double-scattered harmonic wave is shown to be different from that of the single-scattered wave; this fact can be used to find out whether or not double scattering is actually taking place. Moreover, measurement of the intensity of the double-scattered wave can be used to determine the density of electrons in the scattering material. We also show that double scattering is negligible both for the fundamental and harmonic waves if resonance is excited by incident radiation of half the natural frequency (w = wo/2).
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