atomic polarization

physics

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June 11, 2026

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Atomic polarization, also known as electric polarization, is a phenomenon in physics where the positive and negative charges within an insulator (or dielectric) shift slightly in opposite directions when exposed to an external electric field. This distortion creates an electric dipole moment within the atom, making one side slightly positive and the other slightly negative. In some materials, like water, molecules can also rotate to align with the electric field, contributing to polarization.12

A polaron is an electron moving through a solid material that causes a localized distortion in the surrounding charges, creating a region of polarization that travels with the electron. This interaction makes the polaron behave as a particle with a mass greater than a free electron.3

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Speed of sound and electric properties
The second effect, atomic polarization, arises because there is a relative change in the mean positions of the atomic nuclei within the molecules. This generally small effect is observed at radio frequencies but not at optical, and so it is missing from the refractive index. The third effect,…
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The second effect, atomic polarization, arises because there is a relative change in the mean positions of the atomic nuclei within the molecules. This generally small effect is observed at radio frequencies but not at optical, and so it is missing from the refractive index. The third effect,…
Read More