(thermal broadening, thermal Doppler broadening)
(broadening of spectral lines due to velocities of the photon sources)
(aka thermal broadening or thermal Doppler broadening)
spectral line width due to the
motion of the particles emitting the photons, e.g., thermal motion.
By studying the shape of the line, inferences can be made about
the source of the radiation.
broad emission line region
line shape function