Spectral lines

Spectral lines

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Print broadening

The pressure or collision broadening comes about through the interaction of the excited atoms with collision partners and becomes noticeable when the density and thus the pressure of the gas becomes so high that the mean time between two collisions is in the order of magnitude of the lifetime of the excited states. However, as described for the natural line width, a reduction in the service life leads to a broadening of the line. For a detailed treatment of pressure broadening, the elastic and inelastic impact processes must be described.

In an atomizer typical for atomic absorption spectroscopy (AAS), Doppler and pressure broadening usually play the main role because of the high temperatures, while the natural line width is negligibly small.

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