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Observable transitions in atoms and molecules

Different atoms and molecules absorb radiation of different wavelengths. An absorption spectrum will exhibit a number of sharp lines (specifically for [Pg.89]

Absorption of UV and visible radiation in organic molecules is restricted to certain functional groups (chromophores) that contain valence electrons of low excitation energy. The spectmm of a molecule containing these chromophores is complex, due to the superposition of rotational and vibrational transitions on the electronic transitions. These result in a combination of overlapping lines, which have the [Pg.89]

Most absorption spectroscopy of organic compounds is based on transitions of n or tt electrons to the tt excited state. Their absorption peaks fall into the experimentally convenient wavelength region A S [Pg.90]

200—700 nm. Note that these transitions need an unsaturated group in the molecule to provide the tt electrons. Molar absorbtivities associated with n — tt transitions are low, normally of the order of e = 10—lOOmor cm. For tt — tt transitions one [Pg.90]

For a detailed discussion of all electro-transfer mechanisms in molecules you may consult standard textbooks on molecular spectroscopy, such as Hollas (2003). [Pg.90]


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Atoms-In-Molecules

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Molecules atoms

Molecules transitions

Transitions in Molecules

Transitions observational

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