Hot gases don’t produce a continuous emission spectrum. Black hydrogen absorption lines are at the same wavelength as the bright hydrogen emission lines. Key fact Line emission spectra are ...

This causes an absorption spectra, as shown below. Because the energy levels are the same, the lines in the emission spectra of an element are in the same position as the lines in the absorption ...

The techniques are all based on the emission or absorption of radiation in the visible or ultraviolet region of the electromagnetic spectrum. The full background to these techniques is set out in ...