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FVidal
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Rayleigh scattering formula on a colloidal system
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SUMMARY
The discussion centers on the Rayleigh scattering formula, which is applicable for single scattering events involving particles significantly smaller than the wavelength of light. The Tyndall effect, in contrast, involves multiple scattering from various points within a colloidal suspension. The Rayleigh approximation is favored for its simplicity and effectiveness in explaining phenomena such as the blue sky, while Mie scattering calculations are recommended for more complex scenarios involving larger particles. The referenced thesis by Colby et al. provides insights into light-scattering measurements in dense optical systems.
PREREQUISITES- Understanding of Rayleigh scattering principles
- Familiarity with Mie scattering theory
- Knowledge of light-scattering measurements
- Basic concepts of colloidal systems
- Research Rayleigh scattering applications in atmospheric science
- Explore Mie scattering calculations using software tools
- Study the geometry of light scattering in colloidal suspensions
- Investigate the wavelength dependence of scattering phenomena
Researchers, physicists, and students in optics, particularly those focused on light scattering in colloidal systems and atmospheric phenomena.
- #2
Paul Colby
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Tyndall effect looks to be a multiple scatter effect where light scattered from more than one point in the suspension. The Rayleigh formula is for single scattering.
I actually did a masters thesis on multiple scattering.
"Light-scattering measurements from dense optical systems" P. C. Colby, L. M. Narducci, V. Bluemel, and J. Baer. Phys Rev A Vol. 12, Num 1, Oct 1972 pages 1530-1538.
I actually did a masters thesis on multiple scattering.
"Light-scattering measurements from dense optical systems" P. C. Colby, L. M. Narducci, V. Bluemel, and J. Baer. Phys Rev A Vol. 12, Num 1, Oct 1972 pages 1530-1538.
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hutchphd
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"Can I use" is a loaded question.
For example, are you interested in the geometry of the scattering, the wavelength dependence, or the forward transmittance or something else?
The Rayleigh approximation describes scattering from a single particle that is much smaller than the wavelength. It is applied whenever you can get away with it because it is relatively easy to use and understand. It will tell you why the sky is blue but not why the clouds are white! (This refers to a famous final exam question for classical electrodynamics)
So what is it you need to characterize? There are programs extant to calculate Mie Scattering but they are less inviting.
For example, are you interested in the geometry of the scattering, the wavelength dependence, or the forward transmittance or something else?
The Rayleigh approximation describes scattering from a single particle that is much smaller than the wavelength. It is applied whenever you can get away with it because it is relatively easy to use and understand. It will tell you why the sky is blue but not why the clouds are white! (This refers to a famous final exam question for classical electrodynamics)
So what is it you need to characterize? There are programs extant to calculate Mie Scattering but they are less inviting.
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