Abstract
Fluorescence spectroscopy is inherently one of the most sensitive analytical methods. Raman spectroscopy for example has been developed to the point where it is capable of measuring 10−3 M concentrations. Raman scattering is characterized by cross-sections of ca. 10−29 cm2. Typical values for molecular absorption are 10−17 cm2 so that fluorescence methods should be capable of detecting 10−15 M concentrations. Such values have in fact been obtained (1) although one is usually limited by background fluorescence before such concentrations are reached (2). Typical values for atomic absorption are 10−13 cm2 so that atomic fluorescence methods should be capable of detecting 10−19 M or 60 atoms/cm3 concentrations. A classic experiment by Fairbanks, Hänsch, and Schawlow demonstrated detection of 100 Na atoms/cm3 in a heated cell (3).
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© 1984 Plenum Press, New York
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Wright, J.C. (1984). Laser Excited Fluorescence Methods in Analytical Chemistry. In: Kompa, K.L., Wanner, J. (eds) Laser Applications in Chemistry. NATO ASI Series, vol 105. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2739-4_7
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DOI: https://doi.org/10.1007/978-1-4613-2739-4_7
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