Explain why analytical measurements would deviate from Beer's Law if the hollow cathode lamp emission were broader than the absorption profile of the absorbing species.
If the true widths of the spectral lines emitted by the hollow cathode lamp are on the order of 0.02 - 0.05 Å, what causes your measured Ca line to appear so broad? my measured full width at half maximum was 0.5A.
It the absorption from hollow cathode lamp emission were borader then it will give weak and broad spectral peaks. The hollow cathode lamp emission is the only way to control the monochromatic nature of incident of light. If it will emit borader light then the light will have many wavelengths which will weaken the signal.
The observed boradening can be explained by the help of
a) Opaque broadening:
When we have a range of wavelength used in absroption spectroscopy, inspite of monochromatic light then there will be different photons with varied energy.
Now there will be photons in the centre of light and at the edge of light (side).
The photons at the centre will reabsorbed more than photons at the edges of line and hence this cause increase in intensity of photons at the edge as compared to central photons this causes broadening
Explain why analytical measurements would deviate from Beer's Law if the hollow cathode lamp emission were...