The reason for an emission line of the hollow-cathode lamp for molybdenum to develop a cuplike crater at its maximum at higher current 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 compared to the frequencies nearby.
Until the lamp current is less than 50 mA for a hollow cathode lamp for molybdenum, the emission spectrum is a sharp line at 313.3 nm.
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