Abstract
The term absorption spectroscopy is used to denote the qualitative or quantitative measurement of the absorbance of a material as a function of the wavelenght or wavenumber. With quantitative measurements using a parallel beam of light the so-called “transmittance” of a plane-parallel layer,
is measured, where I and I0 denote the radiation flux after and before the transmission of the radiation through the absorbing layer1. Even a measurement of this order of simplicity, however, involves certain complications. If a continuous beam of light enters into a homogeneous medium bounded by plane-parallel windows, it is partially reflected at each phase boundary, while within the medium it is partially absorbed and partially scattered.
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References
For methods of spectroscopic measurement see Kortüm, G.: Kolorimetrie, Photometrie und Spektrometrie (Colorimetry, photometry and spectrometry), 4th edition. Berlin-Göttingen-Heidelberg: Springer 1962.
Schachtschabel, K.: Ann. Physik 81 (4), 929 (1926).
This is the reason for the well-known ability of infrared radiation to penetrate through mist and haze.
Stimson, M. M., and M. J. O’Domtell: J. Am. Chem. Soc. 74, 1805 (1952).
Schiedt, U., and H. Reinwein: Z. Naturforsch. 7b, 270 (1952);
Schiedt, U., and H. Reinwein: Z. Naturforsch. 8b, 66 (1953).
See, for example, Lejeune, R., and G. Duyckaerts: Spectrochim. Acta 6, 194 (1954).
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© 1969 Springer-Verlag Berlin-Heidelberg
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Kortüm, G. (1969). Introduction. In: Reflectance Spectroscopy. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-88071-1_1
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DOI: https://doi.org/10.1007/978-3-642-88071-1_1
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