The reason behind the use of source modulation in atomic absorption spectroscopy needs to be explained.
Spectral lines are lines which help in identifying the atoms and molecules. These are a result of absorption or emission of light in a comparatively narrower frequency range as compared to the frequencies nearby.
Monochromators are optical devices which transmit from a wide range of available wavelengths, a mechanically selectable narrow wavelength band. These could be wavelengths of light or any other radiation.
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