Spectroscopic Methods of Analysis: Diffuse Reflectance Spectroscopy

Authored by: Herbert Michael Heise

Encyclopedia of Pharmaceutical Science and Technology

Print publication date:  July  2013
Online publication date:  July  2013

Print ISBN: 9781841848198
eBook ISBN: 9781351124874
Adobe ISBN:

10.1081/E-EPT4-v5-5

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Abstract

In the field of molecular spectroscopy, absorption measurements with electromagnetic radiation covering the wavelengths between 200 nm and 20 μm can be used for analytical applications. By convention, tags such as ultraviolet (UV), visible (VIS), and infrared (IR) were given to special intervals of the spectrum, each yielding different specific information on organic and inorganic substances. The energy for electronic transitions between outer molecular orbitals corresponds to radiation of the first two spectral regions noted, whereas vibrational spectroscopy is connected to the infrared. Here, it can be further distinguished between near- and mid-infrared spectral subregions, which are important for routine analytical work.

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