The Doppler effect is one of the sources of the line broadening in atomic absorption spectroscopy…

The Doppler effect is one of the sources of the line
broadening in atomic absorption spectroscopy. Atoms moving toward the light
source encounter higher-frequency radiation than atoms moving away from the
source. The difference in wavelength Dl experienced by an atom moving at speed
v (compared to one at rest) is Dl/l 5 v/c, where c is the velocity of light.
Estimate the line width (in nanometers) of the lithium line at 670.776 (6707.76
Å) when the absorbing atoms are at a temperature of (a) 2000 K and (b) 3120 K.
The average speed of an atom is given by  where k is Boltzmann’s constant, T is the
absolute temperature, and m is its mass.

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