Self-broadening and self-shifting of methyl fluoride,
have been investigated in the 50–408 GHz range for the rotational transitions J=0→1, J=1→2, J=2→3, J=5→6, and J=7→8 and for their
Stark components, as they were well resolved by an appropriate electric field. The experimental
-dependence of the collisional relaxation parameters is in very good agreement with the theoretical one, developed within semiclassical perturbative approximations. In case where Stark components are not isolated anymore, discrepancy of profiles with sums of Voigt profile is observed. This is explained in terms of collisional line-coupling effect.