Nonspherical extinction and absorption efficiencies
Abstract
A study is made of the absorption and scattering properties of electromagnetic radiation interacting with nonspherical particles. The suppression of particle resonances in classical Mie scattering theory is considered. It is demonstrated that the nonspherical corrections are related to the imaginary and real components of the index of refraction and the size parameter. With increasing real components of the index of refraction, the resonance phenomena is restricted to small size parameters. For solar wavelengths when the real component is greater than or equal to 2, cloudsize particle resonance phenomena is negligible. As this value decreases, nonsphericity increasingly influences scattering and absorption. For values less than 2 and for imaginary components near 10 to the 5th power, the suppression of particle resonances in Mie theory estimates increases in absorption efficiency of several orders of magnitude near the absorption peak.
 Publication:

Applied Optics
 Pub Date:
 October 1978
 DOI:
 10.1364/AO.17.003159
 Bibcode:
 1978ApOpt..17.3159W
 Keywords:

 Atmospheric Attenuation;
 Atmospheric Refraction;
 Extinction;
 Mie Scattering;
 Particles;
 Graphs (Charts);
 Particle Size Distribution;
 Refractivity;
 Shapes;
 Physics (General);
 ATMOSPHERIC OPTICS;
 SCATTERING;
 ABSORPTION;
 DIFFRACTION;
 PARTICLES;
 MIE THEORY