A many-body treatment of pressure shifts associated with foreign-gas broadening is presented. The theory treats the case of electrically neutral molecules interacting through higher-order permanent moments. The line-shape analysis is developed using graphical finite-temperature perturbation theory. It is shown that the simplest application of the method of moments leads to unphysical results for the pressure shift. It is found that, if certain "quasiparticle" approximations are made before computing the spectral moments, physically sensible results obtain. Explicit expressions for the pressure shift are given for the case of dipole-dipole, dipole-quadrupole, and quadrupole-quadrupole interactions.
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R. W. Davies (1975) studied this question.
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