Pressure-broadened widths of vibration-rotation lines in the infrared spectra of methane have been measured at very high resolution. Systematic variations of linewidths as a function of tetrahedral symmetry4 were found for a variety of foreign gases, and for both 12CH4 and 13CH4. These experimental results follow a pattern predicted in earlier calculations of scattering of argon from methane.
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Kenneth R Fox (1984) studied this question.
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