Accession Number:

AD0613490

Title:

THE ANGULAR VARIATION OF LIGHT SCATTERED BY SINGLE DIOCTYL PHTHALATE AEROSOL DROPLETS,

Descriptive Note:

Corporate Author:

INDIANA UNIV BLOOMINGTON

Personal Author(s):

Report Date:

1960-06-27

Pagination or Media Count:

10.0

Abstract:

The light-scattering diagrams of single aerosol droplets of dioctyl phthalate bis-2-ethylhexyl phthalate have been determined by charging them, suspending them in an electrostatic field, illuminating them with monochromatic light of wavelength lambda and measuring the light scattered into a photometer moving over a range of 40 to 140 degrees from the direction of illumination. Particle radius r was calculated from rate-of-fall measurements and the Stokes-Cunningham-Millikan equation. Good agreement was obtained with scattering diagrams calculated from the Mie theory, which indeed provide a more sensitive measurement of particle size than do rate-of-fall measurements. Detailed calculations of scattered intensity according to the Mie theory have been made at angular intervals of 1 degree over the range of size parameter alpha 2 pi rlambda 0.10.130.0 for a refractive index of 1.486 and at several values of alpha for a refractive index of 1.50. The number of maxima in the scattering diagrams increases with alpha. Graphs of the angular position of the maxima in the two polarized components show that new maxima are formed by splitting where the curves for the two polarized components intersect and the siz5 parameter is approximately divisible by pi4. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE