The following definitions are useful in a discussion of UV/Vis spectroscopy.
chromophore Any group of atoms that absorbs light whether or not a color is thereby produced.
auxochrome A group which extends the conjugation of a chromophore by sharing of nonbonding electrons.
bathochromic shift The shift of absorption to a longer wavelength.
hypsochromic shiftThe shift of absorption to a shorter wavelength.
hyperchromic effect An increase in absorption intensity.
hypochromic effect A decrease in absorption intensity.
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