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- W4255303460 abstract "Conventional infrared reflection spectra of organic compounds are generally characterized by their lack of detail and consequently yield very little information. At the low absolute level of the absorption index K prevailing in these materials in the infrared region, the intensity of reflection is hardly affected even by fairly large relative changes in the value of K. This causes the reflection spectra to show considerably less contrast between regions of transparency and absorption than do absorption spectra. A great improvement of this contrast is obtained if a new method based on the principle of attenuated total reflection is used. Rather than the plain boundary of the sample the interface between the sample and a transparent medium with a high refractive index, like KRS 5 or AgCl, is taken as the reflecting surface. Under these conditions the relative refractive index at the interface becomes smaller than unity. Radiation incident on the interface at an angle somewhat larger than the critical angle will now be totally reflected, but only in those wave-length regions where the second medium is non absorbing (K=0). In wave-length regions with, reflection will not be total any more and accordingly an infrared reflection spectrum of high contrast and intensity may be obtained, which strongly resembles a transmission spectrum. These spectra may, after calibration, be used as such for quantitative purposes. They may also, however, by application of the Kramers-Kronig relations, be converted into spectra of the optical constants N and K, and hence into the absorption spectra. Some examples of spectra obtained with this method will be given." @default.
- W4255303460 created "2022-05-12" @default.
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- W4255303460 date "1962-01-01" @default.
- W4255303460 modified "2023-10-14" @default.
- W4255303460 title "ATTENUATED TOTAL REFLECTION" @default.
- W4255303460 doi "https://doi.org/10.1016/b978-1-4832-1331-6.50034-1" @default.
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