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Chapter 14 APPLICATION OF ULTRAVIOLET/VISIBLE MOLECULAR ABSORPTION SPECTROMETRY - page 12 / 33

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n * and * Transitions

Most applications of absorption spectroscopy are based upon transitions for n or electrons to the * excited state because the energies required for these processes bring the absorption peaks into an experimentally convenient spectral region (200 to 700 nm). Both transitions require the presence of an unsaturated functional group to provide the orbitals. The molar absorptivities for peaks associated with excitation to the n, * state are generally low and ordinarily range from 10 and 100 L cm-1 mol -1; values for * transitions, on the other hand, normally fall in the range between 1000 and 10,000.

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