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Local mode treatment of vibrations

Normal modes of vibration, with their corresponding normal coordinates, are very satisfactory in describing the low-lying vibrational levels, usually those with u = 1 or 2, which can be investigated by traditional infrared absorption or Raman spectroscopy. For certain types of vibration, particularly stretching vibrations involving more than one symmetrically equivalent terminal atom, this description becomes less satisfactory as v increases. [Pg.187]

This seems reasonable when we think only in terms of normal vibrations, but intuition suggests that, since the dissociation in Equation (6.90) would require something like six times the C—H bond dissociation energy ca 6 x 412 kJ mol ), the process [Pg.188]

This local mode behaviour applies to vibrations of many other molecules with two or more equivalent terminal atoms, and CO2 is such an example. [Pg.188]

It should be realized, though, that either model can be used for levels for all values of v for such stretching vibrations but the normal mode model is more practically useful at low v and the local mode model more useful at higher values of v. [Pg.188]

9 Here, the Wilson numbering system is being used, which is frequently used for benzene (see the bibliography). [Pg.187]


See other pages where Local mode treatment of vibrations is mentioned: [Pg.187]    [Pg.187]   


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