Abstract
An approximation, accurate to better than 0.5%, to the Anderson-Tsao-Curnutte theory of linewidth is presented. This approximation is shown to be suitable for calculating linewidths of symmetric top molecules where dipole-dipole forces are dominant, but higher-order multipole terms are not negligible. Some insight is gained as to the relative importance of various types of collisions between interacting molecules from this approach to the calculation of the spectral linewidths for rotational states of molecules. Experimental results for CH 3 35Cl and CH 3 127I are presented for comparison with the calculated results.
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