Infrared Absorption Spectra of Non-Spherical Particles Treated in the Rayleigh-Ellipsoid Approximation

  • Donald R. Huffman
  • Craig F. Bohren


A comparison of small particle extinction spectra calculated for spheres with extinction measurements shows the inadequacy of the spherical approximation in treating strong infrared absorption bands. A simple expression for absorption cross sections of non-spherical particles is derived by integrating over a distribution of shape parameters in the Rayleigh-ellipsoid approximation. For comparison with the theoretical results infrared extinction measurements were made of sub-micron quartz particles dispersed in a KBr matrix. The favorable comparison of theory and experiment suggests that the treatment of shape effects in infrared absorption spectra by means of a distribution of ellipsoids constitutes a major improvement.


Absorption Cross Section Shape Effect Infrared Absorption Spectrum Ellipsoidal Shape Quartz Particle 
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Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • Donald R. Huffman
    • 1
  • Craig F. Bohren
    • 2
  1. 1.Dept. of PhysicsUniv. of ArizonaTucsonUSA
  2. 2.Institute of Atmospheric PhysicsUniv. of ArizonaTucsonUSA

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