History of spectroscopy:
Spectroscopy is the study of the interaction between matter and electromagnetic radiation and the resulting physics dealing with the study of radiation absorbed, reflected, emitted or scattered by a material.
Spectroscopy arose in 17th Century; Experiment by Isaac Newton in 1672 observed all colors of a rainbow in sunlight as shown in Figure 34.05.
Figure 34.05: Scattering of light in prism.
Later, Infrared (IR) radiation by Herschel in 1800 was reported at the long wavelength end. Similarly, Ritter shown the Ultraviolet radiation in 1801 at the short wavelength end.
Both UV and IR are now of great importance in different areas, such as environmental sciences (IR and UV) and communications (IR).