Abstract
In order to study the effect of intermolecular collisions on the shape of microwave absorption lines one has to correct the experimental data for the contributions due to the Doppler effect and collisions of molecules with the walls of the absorption cell. The combined effect of the broadening due to the Doppler effect and intermolecular collisions has been treated extensively by Yajima (1961). The effect of wall collisions, however, has only been considered, by Danos and Geschwind (1953), for very low pressures when broadening due to intermolecular collisions can be neglected. A unified treatment is given of collision broadening due to both intermolecular and wall collisions. It is shown that the combined line shape is nearly Lorentzian even at low pressures, where the mean free path is of the order of magnitude of the dimension of the absorption cell.
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