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The Umov Effect for Large Irregular-Shaped Particles

  • OPTICS OF CLUSTERS, AEROSOLS, AND HYDROSOLES
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Abstract

Results of studying the Umov effect for nonspherical particles large as compared to the incident radiation wavelength are presented. The study is carried out for particles with the maximum size of 100, 140, 170, and 200 µm. The results have been obtained for 210 different refractive indices whose real part varied from 1.3 to 1.6 with a step of 0.5 and the imaginary part varied within the range from 0 to 0.1344. It has been found that the Umov effect occurs for all abovementioned particles provided that the imaginary part of the refractive index is less than 0.001.

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Funding

Verification of the Umov effect was supported by the Russian Science Foundation (project no 19-77-10 022). Calculations of light scattering phase functions within the geometrical optics approximation were supported by the Russian Foundation for Basic Research (project nos. 19-45-703 010 and 21-55-53 027). The physical optics method was modernized under the financial support of the Ministry of Science and Higher Eduction (V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences).

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Correspondence to I. V. Tkachev, D. N. Timofeev, N. V. Kustova, A. V. Konoshonkin or K. A. Shmirko.

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Translated by A. Nikol’skii

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Tkachev, I.V., Timofeev, D.N., Kustova, N.V. et al. The Umov Effect for Large Irregular-Shaped Particles. Atmos Ocean Opt 34, 596–602 (2021). https://doi.org/10.1134/S1024856021060269

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  • DOI: https://doi.org/10.1134/S1024856021060269

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