Scattering amplitude of absorbing and nonabsorbing spheroidal particles inthe WKB approximation

This work is devoted to a theoretical study of scattering of light by absor bing and nonabsorbing oriented spheroidal particles in the Wentzel-Kramers- Brillouin (WKB) approximation. Within the framework of the scattering theor y, we investigate the form factor and the scattering amplitude for this app roximation. The Rayleigh-Gans-Debye theory (RGD), the diffraction approxima tion (DA), and the anomalous diffraction (AD) are treated as particular cas es for nonabsorbing spheroids. To illustrate our formalism, we analyze some numerical examples. (C) 2001 Elsevier Science Ltd. All rights reserved.