The method of Stogryn and Hirschfelder, which divides twohyphen;particle phase space into bound, metastable, and free particle parts, is applied to the statistical averages which determine the first three spectroscopic moments of ``collisionhyphen;induced'' farhyphen;infrared and Raman spectra. Numerical results are presented for a number of models of noble gas systems. It is shown that for some systems, but not all, dimers make important, although not necessarily wellhyphen;separated, contributions to the spectrum.
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