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The Interaction of Light with Biological Molecules
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Summary for the Interaction of Light with Biological MoleculesCells and organisms that make up biological systems stay alive by a constant input of energy. For almost all organisms, this energy comes directly or indirectly from sunlight. Sunlight is in the form of individual packets of energy called photons, which have characteristic wavelengths. The photons in visible light range from 400 nm (blue) to 700 nm (red); the shorter wavelength photons have more energy than those with longer wavelengths.
Molecules with conjugated double bonds can absorb the energy in visible light photons, moving an electron from the ground state to an excited state. Once in an excited state the energy can be lost through the four de-excitation processes
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