Accession Number : ADA185930

Title :   The Application of Vector Diffraction to the Scalar Anomalous Diffraction Approximation of van de Hulst.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Mahood, Robert W

PDF Url : ADA185930

Report Date : May 1987

Pagination or Media Count : 101

Abstract : The extinction, absorption, and differential scattering cross sections of particles are, in general, functions of the polarization state of the incident radiation; however, this dependency cannot be predicted by van de Hulst's anomalous diffraction approximation because it is a scalar theory. To overcome this deficiency, the Kirchoff and Kirchoff-Kottler vector diffraction formulations were used to modify anomalous diffraction in the hope that polarization effects could then be accounted for. Unfortunately, even with the modification, no polarization dependence was predicted for any of the cross sections. In actuality, the differential scattering cross section did show a second-order polarization dependence, but it was negligible within the limits of the approximation. In addition to the above work, a comprehensive, critical literature review of all previous uses of anomalous diffraction was conducted. In this review, the apparent differences between the Cross and Latimer (1970) and Stephens (1984) anomalous diffraction solutions for the extinction and absorption efficiencies of an infinite cylinder were reconciled. (Theses)

Descriptors :   *DIFFERENTIAL CROSS SECTIONS, *ELECTROMAGNETIC SCATTERING, *RADIATION ABSORPTION, *ABSORPTION COEFFICIENTS, *REFRACTIVE INDEX, *THESES, ANOMALIES, CYLINDRICAL BODIES, DIFFRACTION, EFFICIENCY, EXTINCTION, PARTICLES, POLARIZATION, SCALAR FUNCTIONS, SCATTERING, SOLUTIONS(GENERAL), THEORY, VECTOR ANALYSIS

Subject Categories : Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE