We develop a method for estimating the width of spectral lines, which makes it possible to obtain the result in an analytical form at any gas pressure. The method is based on the fact that the Doppler broadening of spectral lines in gases is determ1ned by the mean velocity with which the molecules move to distances of the order of a wavelength of the light wave, rather than by the instantaneous velocity of molecules. The calculated line-width agrees well with the experimental data for hydrogen in a wide range of pressures, including the Dicke narrowing region.
Department of General Physics and Wave Processes, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119991, Russia
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