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Collision Induced Far Infrared Absorption in Argon-Helium Mixtures and Nitrogen at High Pressure

The simplest kind of collision induced far infrared absorption occurs for binary mixtures of rare gases, such as for instance, in an equimolar mixture of argon and helium. In collisions of such unlike atoms, under high pressures for instance, the respective electron clouds of the atoms are deformed and an induced dipole moment persists during the time the two atoms are sufficiently close to each other. The presence of this dipole moment leads to a strong far infrared absorption which is associated with pure translational transitions and this was first reported on by Bosomworth and Gush [1] for various inert gas mixtures.