Ultraviolet and Visible Absorption Spectrometers
Published Online: 15 DEC 2009
Copyright © 2003 by Wiley-VCH Verlag GmbH & Co. KGaA. All rights reserved.
Encyclopedia of Applied Physics
How to Cite
Lipson, R. H. 2009. Ultraviolet and Visible Absorption Spectrometers. Encyclopedia of Applied Physics. 353–380.
- Published Online: 15 DEC 2009
An overview of spectroscopy fundamentals for atoms and molecules is provided as they pertain to the ultraviolet (UV) and visible spectral regions. Topics include state labels, electronic selection rules, the Born–Oppenheimer approximation, and the Franck–Condon principle. The Beer–Lambert law, chemometrics, derivative spectroscopy, and circular dichroism spectroscopy are explained as are the origins of UV/visible transitions in organic and inorganic compounds as well as solids. Relevant experimental methods and instrumentation such as light sources, monochromators, and detectors, which can be used to record UV/visible absorption spectra, are described. A brief discussion on laser-based techniques, including fluorescence excitation spectroscopy, excitation spectroscopy with mass detection, and cavity ring-down spectroscopy, is also given.
- Origin of ultraviolet and visible absorptions in atoms, organic and inorganic compounds, and solids;
- selection rules;
- Franck–Condon principle;
- Beer–Lambert law;
- experimental methods