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Forbidden Band

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forbidden band [fər¦bid·ən ′band]
(solid-state physics)
A range of unallowed energy levels for an electron in a solid.
Forbidden Band 

a region of values of energy that electrons in an ideal crystal (without defects) cannot have. In semiconductors the forbidden band separating the valence band and the conduction band is usually considered. In this case the energy difference between the lower level (bottom) of the conduction band and the upper level (ceiling) of the valence band is called the width of the forbidden band.
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The quadrupole interaction is a just theoretical artifact so far, he admits, but it explains the appearance of forbidden bands arising in a great number of experiments on symmetrical molecules with surface enhanced Raman scattering (SERS).
The dipole-quadrupole theory of surface enhanced Raman scattering by SciTech Book News
Lin proposes a new phenomenon in which photons having wavelengths just outside a crystal's forbidden band cling to the metal lattice.
Hot crystal: lightbulbs and a radiation law may never be the same by Weiss, Peter Ulrich / Science News
Now, a member of that research group, Francisco Meseguer of the Polytechnic University of Valencia in Spain, reports that the scientists have created a structure of rods in air that stops sound in the forbidden band from every angle.
Better seal for see-through sound wall by Science News
 
 
 
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