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isosbestic point |
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isosbestic point [‚ī·səs‚bes·tik ′point] (physical chemistry) During a chemical reaction, a point in the absorption spectrum (that is, a wavelength) where at least two chemical species (for example, reactant and product) have identical molar absorption coefficients, which remain constant as the reaction proceeds. A stable isosbestic point is evidence that a reaction is proceeding without forming an intermediate or multiple products. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| The isosbestic points indicate presence of only one spectrally distinct intermediate species in the measured region of the spectrum in this time window (from microseconds to milliseconds). 6 ppm could be reasonably well approximated as superposition of broad and narrow spectra as is evidenced by the presence of isosbestic points in the superimposed spectra. First, well-defined isosbestic points are observed in the BR films at [asymptotically =]608 nm as well as at ~458 nm (Fig. |
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