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Scattering phase function measurements on single particles and on particle ensembles
Alessandro Rossi1, Laura Botti, Christian Sasse
1Deutsche Forschungsanstalt für Luft- und Raumfahrt, Institut für Technische Thermodynamik, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany.
Applied Optics
|January 14, 2005
Summary
This study measured light scattering by carbon and ash particles larger than light wavelengths. Results provide normalized phase functions for these particles, aiding atmospheric and material science research.
Area of Science:
- Physics
- Chemistry
- Atmospheric Science
Background:
- Understanding light-matter interactions is crucial for atmospheric modeling and material characterization.
- Carbon and ash particles are significant atmospheric aerosols with complex optical properties.
Purpose of the Study:
- To measure the light-scattering phase function of carbon and ash particles.
- To investigate scattering properties in the geometric-optics regime (particle size >> wavelength).
Main Methods:
- Utilized an electrodynamic levitator for single-particle measurements.
- Employed a particle feeder for ensemble measurements.
- Used an argon-ion laser (496 nm) and a xenon lamp as irradiation sources.
Main Results:
- Presented normalized phase functions for carbon and ash particles.
- Data obtained for both single particles and particle ensembles.
- Measurements were conducted in the geometric-optics regime.
Conclusions:
- The study provides essential optical data for carbon and ash particles.
- These findings contribute to improved aerosol optical models.
- Experimental methodologies offer robust approaches for particle scattering measurements.