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- W967560355 abstract "Publisher Summary This chapter discusses the different aspects of clay mineral studied by ultraviolet (u.v.) and visible (vis.) light spectroscopy. It is clear that useful chemical information is also found in the near infrared (n.i.r.) and this region is therefore included in the chapter. With the dimensions of the clay particles comparable to the wavelength, it is impossible to distinguish the phenomena of reflection, refraction, and diffraction. The light is scattered. For closely packed particles, interferences and phase relations arise among the scattered light beams. Together with absorption of light, these scattering phenomena strongly inhibit transmission spectroscopy. Nevertheless, many qualitative transmission measurements on oriented films or sheets have been performed. All these studies involve intense bands, either due to their large absorption coefficients, or to a large concentration of absorbing centers. In diffuse reflectance spectroscopy (DRS), the light intensity scattered at a given wavelength from an “infinitely thick,” closely-packed clay layer is compared with that scattered from an infinitely thick layer of a non-absorbing (white) reference. The ratio of the light intensity scattered from the clay to that from the reference is recorded as a function of the wavelength. This constitutes the diffuse reflectance spectrum." @default.
- W967560355 created "2016-06-24" @default.
- W967560355 creator A5020359281 @default.
- W967560355 date "1982-01-01" @default.
- W967560355 modified "2023-09-26" @default.
- W967560355 title "Chapter 7 Ultraviolet and Visible Light Spectroscopy" @default.
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- W967560355 doi "https://doi.org/10.1016/s0070-4571(08)70020-7" @default.
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