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Reflectance Spectra Obtained by Attenuated Total Reflection

  • Chapter
Reflectance Spectroscopy

Abstract

As was indicated in Chapt. II, c, it is possible in principle to determine the optical constants n and ϰ of materials as a function of λ from regular reflection measurements, i.e. absorption spectra can be obtained. Two measurements are always necessary, e.g., R ⊥ at two different angles of incidence or R reg(α=0) and the phase shift δ, and tedious mathematical or graphical processes are then needed for the evaluation of n and ϰ. The accuracy of the values obtained in this way is not very satisfactory. This is even true for metals, which have very large -values (Table 2). For most substances, especially organic materials, the ϰ-values are considerably smaller even in the IR region, and the refractive indices lie between 1 and 2. Only when ϰ > 0.2 can reliable ϰ-values be obtained in this way from such reflection measurements. This has been shown by Fahrenfort 391. When ϰ = 0.2, which already corresponds to very high extinction coefficients (cf. note 14 on p. 21), optical constants of most substances cannot be obtained by this method.

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  1. Institut für Physikalische Chemie der Universität, 74 Tübingen, Wilhelmstraße 56, Deutschland

    Professor Dr. Gustav Kortüm

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  1. Professor Dr. Gustav Kortüm
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Kortüm, G. (1969). Reflectance Spectra Obtained by Attenuated Total Reflection. In: Reflectance Spectroscopy. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-88071-1_8

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  • DOI: https://doi.org/10.1007/978-3-642-88071-1_8

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-88073-5

  • Online ISBN: 978-3-642-88071-1

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