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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...

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Related Experiment Video

Updated: Jun 16, 2026

Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Polarization of light reflected from rough planetary surface.

|February 16, 2010

Summary

This summary is machine-generated.

This study models light reflection from rough surfaces, explaining negative polarization in celestial bodies like Mars and the Moon. The findings link surface properties to light patterns, aiding astronomical observations.

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Area of Science:

Planetary Science
Optics
Electromagnetism

Background:

Understanding light interaction with rough surfaces is crucial for interpreting astronomical observations.
Previous models often simplified surface irregularities and light scattering phenomena.

Purpose of the Study:

To develop a model for calculating luminance and polarization of light reflected from random, irregular particle surfaces.
To explain the phenomenon of negative polarization observed in celestial bodies.
To provide a tool for analyzing the surface structure and optical properties of rough astronomical bodies.

Main Methods:

Utilized equations of electromagnetic waves and materials with a complex index of refraction.
Incorporated geometric properties of shadows to model light reflection.
Calculated luminance and polarization for single and double reflections from particle faces.

Main Results:

The model accurately reproduces measurements of polarized light from Mars, Mercury, and the Moon, including negative polarization.
Negative polarization at small phase angles is attributed to shade and shadows influencing double-reflected rays.
Graphical results demonstrate the influence of varied real and complex indices of refraction on light polarization and luminance.

Conclusions:

The developed model effectively explains light polarization and luminance from rough surfaces, including negative polarization.
The ratio of single-reflected, double-reflected, and diffused light correlates with surface structure and optical properties.
This model serves as a valuable tool for studying the characteristics of rough astronomical surfaces.