Accession Number : ADA191420

Title :   The Optical Properties of Aerosols.

Descriptive Note : Periodic rept. no. 1 May-Aug 87,

Corporate Author : MODENA UNIV (ITALY)

Personal Author(s) : Borghese, F

PDF Url : ADA191420

Report Date : Aug 1987

Pagination or Media Count : 4

Abstract : This report focused on two points: 1) interpretation of the experimental data now available on the scattering properties of single clusters; 2) extension of our present formalism for the macroscopic optical constants of a dispersion of scatterers to the high-density limit. In view of the difficulty of handling small clusters such as those actually forming the aerosols, the experiments are performed by means of a microwave device using as a target an arrangement of spheres reproducing on an appropriately large scale the cluster of interest. As the refractive index is a function of the frequency, the raw results obtained in this way are appropriately scaled down to yield those for a microscopic cluster illuminated by infrared radiation. Presently there exist a few attempts to describe the optical constants of a high-density dispersion of scatterers based on statistical considerations to simulate the actual dispersion. Among these attempts the most interesting from a computational point of view is that of Varadan, Bringi and Varadan who use the quasi-crystalline approximation of Lax to get solvable equations. Our idea is to go beyond this approximation with the use of a more sophisticated kind of statistics.

Descriptors :   *AEROSOLS, *CLUSTERING, *DISPERSING, *OPTICAL PROPERTIES, COMPUTATIONS, CONSTANTS, EQUATIONS, EXPERIMENTAL DATA, HANDLING, HIGH DENSITY, INFRARED RADIATION, LIMITATIONS, MICROSCOPY, MICROWAVE EQUIPMENT, REFRACTIVE INDEX, SCATTERING, SPHERES, YIELD

Subject Categories : Physical Chemistry
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE