Category Archives: Atomic physics

Doppler Broadening

It is the broadening of the spectral line due to Doppler Effect of the random thermal motion of the molecules. Doppler effect is the change in the frequency of a wave for an observer moving relative to the source of the wave. Spectral line is basically an isolated bright or dark line in the spectrum (portion of the electromagnetic spectrum that is visible by the human eye) produced by emission or absorption of light of a single wavelength. Continue reading