Abstract
Publisher Summary Absorption and emission of radiant energy by molecules and atoms is the basis for many methods in analytical chemistry. By the interpretation of data, both qualitative and quantitative information is obtained. Qualitatively, the positions of the absorption and emission lines or bands that occur in the electromagnetic spectrum indicate the presence of a specific substance. Quantitatively, the intensities of the same absorption and emission lines or bands for the unknown and standards are measured. The concentration of the unknown is then determined from these data. Data obtained from a spectroscopic measurement are in the form of a plot of radiant energy absorbed or emitted as a function of position in the electromagnetic spectrum. This is known as a spectrum, and the position of absorption or emission is measured in units of energy, wavelength, or frequency.
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