One of the mysteries of the English language finally explained.
A wavelength at which the absorption of light by a mixed solution remains constant as the equilibrium between the components in the solution changes.
- ‘The difference spectrum has an isosbestic point at 538 nm, maximum at 500 run and minimum at 586 nm.’
- ‘The isosbestic point of the transition is at 404 nm.’
- ‘Once the absorptivities of the component species become dependent on the external variables, isosbestic points do not occur.’
- ‘This is supported by the finding that the two bands exhibit an isosbestic point, if the spectra are corrected for their temperature dependence.’
- ‘On the contrary, for FP the absence of isosbestic points is indicative of parallel or consecutive reaction channels leading to more than one photoproduct.’
Early 20th century: isosbestic from iso- ‘equal’ + Greek sbestos ‘extinguished’ (from sbennunai ‘quench’) + -ic.
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