Abstract
We report the first experimental evidence of variable collision-broadening parameters within the hyperfine multiplet of a rotational line. A similar behavior is observed in the Stark pattern of one hyperfine line. All the experimental results, obtained on ${\mathrm{CH}}_{3}$I, are explained in terms of a theoretical model accounting for line coupling. The same approach is successful in interpreting the literature data for the Stark lines of ${\mathrm{CH}}_{3}$Br and previous null results for other molecules.
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