trichroism


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Trichroism

When certain optically anisotropic transparent crystals are subjected to white light, a cube of the material is found to transmit a different color through each of the three pairs of parallel faces. Such crystals are sometimes termed trichroic, and the phenomenon is called trichroism. This expression is used only rarely today since the colors in a particular crystal can appear quite different if the cube is cut with a different orientation with respect to the crystal axes. Accordingly, the term is frequently replaced by the more general term pleochroism. Even this term is being replaced by the phrase linear dichroism or circular dichroism to correspond with linear birefringence or circular birefringence. See Birefringence, Crystal optics, Dichroism

McGraw-Hill Concise Encyclopedia of Physics. © 2002 by The McGraw-Hill Companies, Inc.

trichroism

[′trī‚krō‚iz·əm]
(optics)
Phenomenon exhibited by certain optically anisotropic transparent crystals when subjected to white light, in which a cube of the material is found to transmit a different color through each of the three pairs of parallel faces.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive ?
Infrared trichroism is a powerful means of probing the textural evolution of semicrystalline polymers under multiaxial stretching conditions.
Orientation Functions [f.sub.iJ] Calculated for the Crystalline [alpha] Phase From the Trichroism of the Peaks at 1202 and 929 [cm.sup.-1] (Chain Axis c) and 834 and 580 [cm.sup.-1](b-Axis).
Paul's enthusiasm left a lasting impression on the young Dennis when the famous curator cried out "Look at this trichroism!"