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Chapter 14 APPLICATION OF ULTRAVIOLET/VISIBLE MOLECULAR ABSORPTION SPECTROMETRY - page 3 / 33

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ABSORBING SPECIES

The absorption of ultraviolet or visible radiation by a molecular species M can be considered to be a two-step process, excitation

M + h  M*

The lifetime of the excited species is brief (10-8 to 10-9 s). Relaxation involves conversion of the excitation energy to heat.

M* M + heat

The absorption of ultraviolet or visible radiation generally results from excitation of bonding electrons.

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