This excerpt from The Concise Handbook of Analytical Spectroscopy, which spans five volumes, serves as a comprehensive reference, detailing the theory, instrumentation, sampling methods, experimental design, and data analysis techniques for each spectroscopic region. An early example of a colorimetric analysis is Nessler's method for ammonia, which was introduced in 1856. Nessler found that adding an alkaline solution of HgI 2 and KI to a dilute solution of ammonia produced a yellow-to-reddish brown colloid, in which the colloid's color depended on the. A monochromatic electromagnetic wave of wavelength λ propagating along the x-axis of a suitably chosen laboratory coordinate system is schematically represented by classical sinusoidal wave model. When Joseph Fraunhofer, mirror manufacturer, optician and physicist, invented the spectroscope while researching sunlight in 1814, he laid the foundation for one of today's most important scientific analysis methods. It is the foundational science that explores why and how atoms and molecules absorb, emit, or scatter light. Spectroscopy provide perhaps the most widely used tools for elucidation of molecular structure as well as the quantitative qualitative determination of both inorganic and organic compounds.
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