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By Robert Crispin Evans

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Leading lo a much higher vibraLionallevel. The excitation is a150 high in energy because hydrogen bonding is an unusually strong intermolecular inleraction. The absorption of red-orange light depletes while light of red-orange, and leaves the complementary green-blue color. 2) where E is lhe absorplion coefficient, e is the concentration, and I is the length of the sample in the light palh. Because E is rather small for this excitalion in H20, il takes a large path length, 1, to produce a deleclable color.

Absorption of visible Iight can cause the promotion of an electron to tllis excited slate. lf visible Iight is absorbed, the material with conjugaled bonds will be colollred. ) Many organic molecules derive their colon; fram the excitation from electronic states that involve Jarge degrees of conjugation. For example, lhe more than 8000 dyes in use today derive their color from this mechanism. The part of the molecule that favors color production is called a chromophore (meaning ·'color bearing").

Cornrnent on rerative energy efficiencies. 1. rgy efficient? FURTHER READING General References Mast inttoductory physical chenüstry textbooks describe aspeets of electfomagnetic radiation and black-body radiation. Books on rocks and mineral S oflen conlaio information conceming color and composition af geological materials. F. W. Billmeyer, Jr. and M. Sallzman (1981). Prillciples of Colollr Tecllllology. 2nd Ed. John Wiley & Sons Ltd. M. Evans (1948). AIl/lltrodllclioll ro CO/O/: John Wiley & Sons Lld.

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