In atomic emission and atomic absorption spectroscopy, the measured instrumental signal and its relationship with concentration is of great importance. Relationships between the measured intensity and the theoretical intensity or the integrated intensity as a function of spectrometer band width and slit width and the relationships between measured absorbance and the theoretical absorbance or the integrated absorbance as a function of atomic source line width are given. A number of conclusions are drawn regarding the measured parameter. In atomic emission flame photometry, it is shown that the measured intensity usually is proportional to the theoretical integrated line intensity and is independent of the half-width of the atomic emission line. In atomic absorption flame photometry, the measured absorbance is proportional to the theoretical absorbance and is independent of the atomic absorption line width as long as the source line width is much narrower than the atomic absorption line width.

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