Abstract

Measurements have been made of the IR radiation from monodisperse optically absorbing spherical particles of di-2-ethylhexyl sebacate. The purpose was to validate the Mie emission theory for particles that are small compared with the radiation wavelength. In contradiction to the Mie theory, McGregor has theoretically concluded that radiation absorption or emission is not possible at wavelengths longer than 2π times the particle diameter for spherical particles. The present results on monodisperse spherical particles of 3, 1, and 0.5 μm emitting at a wavelength of 3.4 μm support the Mie theory predictions.

© 1984 Optical Society of America

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