LYCOS RETRIEVER 
Spectroscopy: Light
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Spectroscopy is a method used to determine the functional groups in a sample compound that is a solid, liquid, or gas, by exposing a small amount of that sample to various light sources. Spectrophotometers detect and measure the amount of light that a test sample absorbs. Light sources used in spectroscopy are UV/ deuterium lamps, hollow cathode lamps and visible lamps... known as tungsten halogen bulbs or lamps.
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Spectroscopy is the study of the interaction between radiation (electromagnetic radiation, or light, as well as particle radiation) and matter. Spectrometry is the measurement of these interactions and a machine which performs such measurements is a spectrometer or spectrograph. A plot of the interaction is referred to as a spectrogram, or, informally, a spectrum.
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Spectroscopy is the use of light, sound or particle emission to study matter. The emissions are, in many cases, able to provide information about the properties of the matter under investigation. The device often used for such analysis is a spectrometer, which records the spectrum of light emitted (or absorbed) by a given material, especially in analytical chemistry and physical chemistry fields, where the light can be used to determine the chemical composition of a substance because of signature spectral lines emitted by known elements.
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