Raman Spectroscopy makes use of the interaction between a light source--usually in the form of laser--and the molecular vibrations or rotations or other types of molecular movement set off in a specimen from that light so as to create information about the chemical and physical nature of that specimen. It is particularly useful in determining the nature of chemical bonds and the symmetry of molecules. This is the first volume of a two volume set on the background and principles of Raman Spectroscopy and its special applications. This first volume covers the history and theory of Raman Spectroscopy, and the instruments used, including both monochromatic and polychromatic techniques. It continues with an overview of filters and detectors commonly used with Raman Spectroscopy. Finally, it addresses the major applications of this spectroscopy including use in analyzing gases, crystals, and both inorganic and organic compounds.