Interferometric studies of light scattering in gases
Light scattered backwards by four gases, namely, hydrogen, nitrogen, oxygen and carbon dioxide at high pressures has been analysed by a Fabry-Perot interferometer. None of the gases showed displaced components similar to those in liquids. For the heavier gases, N2, O2 and CO2, the Doppler broadening was observed to be too small to be detectable with mercury radiations. The pattern obtained for hydrogen showed a broadening and the half-breadth of the line was found to be of the order to be expected from Maxwell’s law of distribution of velocities. A weak background due to molecules having relatively high velocities was observed in the scattered patterns for all cases.